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Three

Three Amazons of the Island of Britain

Llewei, daughter of Seitwed; Rore (Rorei), daughter of Usber; and Mederi Badellfawr ('Big Knee'?).
Three Ardent Lovers of the Island of Britain

Caswallawn, son of Beli, for Flur, the daughter of Mugnach Gorr; Trystan, son of Talluch, for Yseult, wife of March Meirchawn, his uncle; and Kynon, son of Clydno Eiddin, for Morvyth, daughter of Urien.
Three Arrogant Men of the Island of Britain

Sawyl High-Head; Pasgen, son of Urien; and Rhun, son of Einiawn.
Three Baptismal Bards of the Island of Britain

Merddin Emrys; Taliesin, Chief of Bards; and Merddin, son of Madoc Morvryn.
Three Battle Defenders of the Island of Britain

A warrior named Selyf is one of these defenders mentioned in the Triads.
Three Battle-Diademed Men of the Island of Britain

Drystan, son of Tallwch; Hueil, son of Caw; and Cai, son of Cenyr of the Fine Beard. Bedwyr, son of Bedrawc, was diademed above the others.
Three Battle-Horsemen of the Island of Britain

According to the Triads: Menwaedd of Arllechwedd (Mewaedd) Menedd; Caradawg Strong-Arm and Llyr of the Hosts (Lludd Llyurgavc).
Three Battle-Leaders of the Island of Britain

Selyf, son of Cynan Garrwyn; Urien, son of Cynfarch; and Afaon, son of Taliesin.
Three Beloved Horses of the Island of Britain
Three Lover's Horses of the Island of Britain

Grey Fetlock, horse of Dalldaf, son of Cunin Cof; Spotted Dun, horse of Rahawd, son of Morgant; and Pale White Lively-Black, horse of Morfran, son of Tegid.
Three Bestowed Horses of the Island of Britain

Slender Grey, horse of Caswallawn son of Beli; Pale Yellow of the Stud, horse of Lleu Skilful-Hand; and Host-Splitter, horse of Caradawg Strong-Arm.

Drudwas' horse is listed as one of these horses in the Triads.
Three Blissful Rulers of the Island of Britain

Bran the Blessed, the son of Llyr Llediaith, who first brought the faith of Christ to the nation of the Cymry from Rome, where he was seven years a hostage for his son Caradawc, whom the Romans made prisoner through the craft, and deceit, and treachery of Aregwedd Foeddawg (usually supposed to be Cartismandua).

The second was Lleurig ab Coel ab Cyllyn Sant, who was called Lleufer Mawr, (the great Light), and built the ancient church at Llandaff, which was the first in Britain, and who gave the privileges of land, and of kindred, and of social rights, and of society to such as were of the faith of Christ.

The third was Cadwaladyr the Blessed, who gave refuge, with his lands, and with all his goods, to the believers who fled from the Saxons without faith, and from the aliens who would have slain them.
Three Brave Men of the Island of Britain

Three sons of Gleissiar Gogled and Haernwedd Vradawc (the Wily): Grudduei; Henbrien (Henben); and Aedenawg (Edenawg). They return on their biers from battle.
Three Bull-Chieftains of the Island of Britain

Elinwy, son of Cadegr; Cynhafal, son of Argad; and Afaon, son of Taliesin. They were all sons of bards.
Three Bull-Protectors of the Island of Britain

Cynfawr Host-Protector, son of Cynwyd Cynwydion; Gwenddolau, son of Ceidiaw; and Urien, son of Cynfarch.
Three Bull-Spectres of the Island of Britain

The Spectre of Gwidawl; the Spectre of Llyr Marini; and the Spectre of Gyrthmwl Wledig.
Three Chief Cows of the Island of Britain

Llawfrodedd's cow, Cornillo, was one of these.
Three Chief Officers of the Island of Britain

Caradawg, son of Bran; Cawrdaf, son of Caradawg; and Owain, son of Maxen Wledig.
Three Chief Steeds of the Island of Britain

Tall Black-Tinted, horse of Cynan Garrwyn; Eager Long Fore-Legs, horse of Cyhored, son of Cynan; and Red ... Wolf-Tread, horse of Gilbert, son of Cadgyffro. The third horse is called Rudvreon Tuthvleid or Ruthir ehon tuth bleit in the Black Book version of Triad no. 52.
Three Chieftains of Arthur's Court

Triad no. 9 lists Fflewdwr Fflam Wledic and an unnamned son of Seidi as the chieftains. Culhwch gives Chadreith mab Seidi as cheiftain.
Three Chieftains of Deira and Bernica

Gall, son of Disgyfdawd; Ysgafnell, son of Disgyfdawd; and Difydell, son of Disgyfdawd. They were all sons of bards.
Three Closures and Disclosures of the Island of Britain

An alternative to 'Three Concealments and Three Disclosures of the Island of Britain':

First the head of Bendigeid Vran ab Llyr, which Owain the son of Maxen Wledig buried under the White Tower in London, and while it was so placed no invasion could be made upon this Island; the second was the bones of Gwrthevyr the Blessed (Vortimer), which were buried in the chief harbour of the Island, and while they remained there hidden all invasions were ineffectual. The third was the dragons buried by Lludd ab Beli, in the city of Pharaon, in the rocks of Snowdon. And the three closures were made under the blessing of God and his attributes, and evil befel from the time of their disclosure.

Gwrtheyrn Gwrtheneu [Vortigern], disclosed the dragons to revenge the displeasure of the Cymry against him, and he invited the Saxons in the guise of men of defence to fight against the Gwyddyl Ffychti; and after this he disclosed the bones of Gwrthevyr the Blessed, through love of Ronwen [Rowena], the daughter of the Saxon Hengist.

And Arthur disclosed the head of Bendigeid Vran ab Llyr, because he chose not to hold the Island except by his own strength. And after the three disclosures came the chief invasions upon the race of the Cymry.
Three Compeers of Arthur's Court

Dalldav, son of Kimin Cov; Trystan mab March; and Rhyhawd mab Morgant ab Adras.
Three Concealments and Three Disclosures of the Island of Britain

The Head of Bran the Blessed, son of Llyr, which was buried in the White Hill in London. and as long as the Head was there in that position, no Oppression would ever come to this Island; The second: the Bones of Gwerhefyr the Blessed which were buried in the Chief Ports of this Island; The third: the Dragons which Lludd son of Beli buried in Dinas Emrys in Eryri.

The text of the Early Version Triad is incomplete. The Red Book's version includes the disclosures: the Bones (for the love of a woman) and the Dragons by Gwrtheyrn the Thin (Vortigen); the Head by Arthur because it did not seem right to him that this Island should be defended by the strength of anyone other than him.
Three Counselling Knights Were in the Court of Arthur

Cynon the son of Clydno Eiddin, and Aron the son of Kynfarch ap Meirchion gul, and Llywarch hen the son of Elidir Lydanwyn. And these three knights were the Counsellors of Arthur, and whatever dangers threatened him in any of his wars, they counselled him, so that none was able to overcome Arthur; and thus he conquered all the nations through three things which followed him; and these were, Good hope, and the consecrated arms which had been sent him, and the virtue of his warriors; and through these he came to wear twelve crowns upon his head, and he became Emperor of Rome.
Three Damsels

A pine tree in the forest of Darnantes where, as a hermit once told Tristan (Tristram) and Kahedins, many adventures could be found.
Three Damsels of the Clear Fountains
Three Maidens of the Clear Fountains

Three beautiful maidens residing at Arthur’s court, possibly with some connection to the Clear Fountain of Love.
Three Defilements of the Severn
Three Diademed Men of Britain

One of them were Gwair.
Three Dishonoured Men of the Island of Britain
Three Enchanters of the Island of Britain

Coll, son of Collfrewy; Menw, son of Teirgwaedd; and Drych, son of Kibddar.
Three Enemy-Subduers of the Island of Britain

Griediawl Enemy-Subduer, son of Envael Adrann (Evael Adrann); Gweir of Great Valor; and Drystan, son of Tallwch.
Three Fair Princes of the Island of Britain
Three Blessed Kings of the Island of Britain

Owain, son of Urien; Rhun, son of Maelgwn; Rhufawn befr, the son of Deorath Wledig (Dewarth).
Three Faithful War-Bands of the Island of Britain

The war-band of Cadwallawn, son of Cadfan, who were with him seven years in Ireland, and in all that time they did not ask him for anything, lest they should be compelled to leave him. The second was the war-band of Gafran, son of Aeddan, who went to sea for their lord; the third was the war-band of Gwenddolau, son of Ceidiaw at Arfderydd (Arderydd), who continued the battle for a fortnight and a month after their lord was slain. Each war-band held twenty-one hundred men.
Three Faithful Women of the Island of Britain

Penarwan, wife of Ywaine, was one of these women.
Three Faithless War-Bands of the Island of Britain

The war-band of Goronwy the Radiant of Penllyn, who refused to receive the poisoned spear from Lleu Skilful-Hand on behalf of their lord, at the Stone of Goronwy, at the head of Cynfal; the second warband was that of Gwrgi and Peredur, who abandoned their lord at Caer Greu, when they had an appointment to fight the next day with Eda Great-Knee; and there they were both slain. And the war-band of Alan Fyrgan, who turned away from him by night, and let him go with his servants to Camlan. And there he was slain.
Three Fettered Wives of the Island of Britain
Three Faithless Wives of the Island of Britain

The war-band of Goronwy the Radiant of Penllyn, who refused to receive the poisoned spear from Lleu Skilful-Hand on behalf of their lord, at the Stone of Goronwy, at the head of Cynfal; the second warband was that of Gwrgi and Peredur, who abandoned their lord at Caer Greu, when they had an appointment to fight the next day with Eda Great-Knee; and there they were both slain. And the war-band of Alan Fyrgan, who turned away from him by night, and let him go with his servants to Camlan. And there he was slain.
Three Fettered Men of the Island of Britain

Cadwaladr the Blessed; Rhun, son of Maelgwn, and Rhiwallawn Broom-Hair.
Three Fettered War-Bands of the Island of Britain
Three Frivolous Bards of the Island of Britain

Arthur; Cadwallawn, son of Cadfan; Rahawd, son of Morgant.
Three Gate-Keepers at the Action of Bangor Orchard

Gwgon Red Sword; Madawg, son of Rhun; and Gwiawn, son of Cyndrwyn. Another constellation is: Hawystyl the Arrogant; Gwaetcym Herwuden; and Gwiner.
Three Generous Men of the Island of Britain

Nudd the Generous, son of Senyllt; Mordaf the Generous, son of Serwan; Rhydderch the Generous, son of Tudwal Tudglyd. Arthur was, of course, more generous than these men.
Three Golden Corpses of the Island of Britain

Madawg, son of Brwyn; Cengan Peiliawg; and Rhuawn the Radiant (Rhufawn), son of Gwyddno.
Three Golden Shoemakers of the Island of Britain
Three Golden-Tounged Knights of the Island of Britain

A trio of Arthur’s knights - Gwalchmei, Drudwas mab Tryffin, and Eliwlod ab Madawc ab Uthur - who were able to complete their quests and achieve their desires through their particularly able use of speech.

Llew is also said to be a member of this group.
Three Great Enchantments of the Island of Britain

Enchantment of Math, son of Mathonwy, which he taught to Gwydion, son of Don; the Enchantment of Uthyr Pendragon, which he taught to Menw, son of Teirwaedd; and the Enchantment of Gwythelyn the Dwarf, which he taught to Coll, son of Collfrewy, his nephew.
Three Great Exploits of the Island of Britain

The ship of Nevydd Nav Neivion, which carried in it a male and female of all things living, when the Lake of floods burst forth; and the horned oxen of Hu the Mighty, which drew the Avanc of the Lake to land, so that the Lake burst forth no more; and the stones of Gwyddon Ganhebon, on which were read all the arts and sciences of the world.
Three Great Queens of King Arthur

Gwenhwyfar, daughter of (Cywryd) Gwent; Gwenhwyfar, daughter of Gwythyr, son of Greidiawl; and Gwenhwyfar, daughter of Gogfram the Giant.
Three Harmful Blows of the Island of Britain
Three Horses Who Carried the Three Horse-Burdens

Black Moro, horse of Elidir Mwynfawr, who carried on his back seven and a half people from Penllech in the North to Penllech in Mon. These were the seven people: Elidir Mwynfawr, and Eurgain his wfe, daughter of Maelgwn Gwynedd, and Gwyn Good Companion, and Gwyn Good Distributor, and Mynach Naomon his counsellor, and Prydelaw the Cupbearer, his butler, and Silver Staff his servant, and Gelbeinevin his cook, who swam with his two hands to the horses crupper - and that was the half person, and Corvan, horse of the sons of Eliffer, bore the second Horse-Burden: he carried on his back Gwrgi and Peredur and Dunawd the Stout and Cynfelyn the Leprous(?), to look upon the battle-fog of the (host of) Gwenddolau (in) Ar(f)derydd. (And no one overtook him but Dinogad son of Cynan Garwyn, (riding) upon Swift Roan, and he won censure and dishonour from then till this day.) and Heith, horse of the sons of Gwerthmwl Wledig, bore the third Horse-Burden: he carried Gweir and Gleis and Archanad up the hill of Maelawr in Ceredigion to avenge their father.
Three Irresistible Knights of King Arthur

The gatekeeper Glewlwyd Gafaelfawr is one of these knights.
Three Just Knights of Arthur's Court

Blaes, Cadog, and Pedrog. [More].
Three Kings Who Were From Villeins
Three Kings Who Were Sprung From Villeins
Three Knights of Battle Were in the Court of Arthur

Cadwr, the Earl of Cornwall; Lancelot du Lac; and Owain, son of Urien Rheged.

and this was their characteristic, that they would not retreat from battle, neither for Spear, nor for Arrow, nor for Sword, and Arthur never had shame in battle, the day he saw their faces there, and they were called the Knights of Battle.
Three Levies That Departed From This Land, And Not One Of Them Came Back

The first went with Elen of the Hosts and Cynan her brother, The second went with Yrp of the Hosts, who came here to ask assistance in the time of Cadial son of Eryn. and all he asked of each Chief Fortress was twice as many (men) as would come with him to it; and to the first fortress there came only himself and his servant. (And it proved grievous to have given him that.) Nevertheless that was the most complete levy that ever went from this Island, and no (man) of them ever came back. The place where those men remained was on two islands close to the Greek sea; those islands are Gals and Avena.

The third levy went with Caswallawn son of Beli, and Gwenwynwyn and Gwanar, sons of Nwyfre, and Arianrhod daughter of Beli their mother. And those men came from Arllechwedd. They went with Caswallawn their uncle across the sea in pusuit of the men of Caesar. The place where those men are is in Gascony. And the number that went in each of those Hosts was twenty-one thousand men. And those were the Three Silver Hosts: they were so called because the gold and silver of the Island went with them. And they were picked men.
Three Lively Steeds of the Island of Britain

Grey, horse of Alser, son of Maelgwn; Chesnut Long-Neck, horse of Cai; and Roan Cloven-Hoof, horse of Iddon, son of Ynyr Gwent.
Three Mary's Ointment

According to Chrétien's translator D.D.R. Owen, this was the ointment which Mary Magdalene, Mary Salome, and Mary the mother of James procured to anoint the body of Christ.

Their ointment obviously had excellent curative powers, for King Bagdemagus offered it for the wounds Lancelot sustained from crossing the Sword Bridge. As Owen points out, Bademagu's having this (rather than, say, one of Morgan's preparations) reinforces the echo of the Harrowing of Hell.
Three Men Who Performed the Three Unfortunate Assassinations

Gall son of Dysgyfdawd who slew the Two Birds of Gwenddolau. And they had a yoke of gold on them. Two corpses of the Cymry they ate for their dinner, and two for their supper; and Ysgafnell son of Dysgyfdawd, who slew Edelfled king of Lloegr; and Diffydell son of Dysgyfdawd who slew Gwrgi Garwlwyd ('Rough Grey'). That Gwrgi used to make a corpse of one of the Cymry every day, and two on each Saturday so as not to slay on a Sunday. (Possibly a facetious adaptation of Triad 10 to form a new triad pair with Triad 33. The Anglo-Saxon Chronicle records that Ethelfrith was killed by Raedwald of East Anglia.)
Three Men Who Received the Beauty of Adam

Absalom, son of David; Jason, son of Aeson; and Paris, son of Priam.
Three Men Who Received the Wisdom of Adam

Cato the Old; Bede; and Siblo the Wise.
Three Mistresses of King Arthur

Indeg, daughter of Garwy the Tall; Garwen ('Fair Leg'), daughter of Henin the Old; and Gwyl ('Modest'), daughter of Gendawd ('Big Chin').
Three Noble Retinues of the Island of Britain

The Retinue of Mynyddawg of Eiddyn; the Retinue of Melyn, son of Cynfelyn; and the Retinue of Dryon, son of Nudd.
Three Offensive Knights

Morfran; Sandde, and Glewlwyd. [More].
Three Oppressions That Came To This Land, And Not One Of Them Went Back

One of them (was) the people of the Coraniaid, (The Coraniaid (y Corr(y)anyeit) may be the Tylwyth Teg) who came here in the time of Caswallawn (=Lludd?) son of Beli: and not one of them went back. and they came from Arabia.

The second Oppression: the Gwyddyl Ffichti (The Gwyddyl Ffichti are the Picts). And not one of them went back.

The third Oppression: the Saxons, with Horsa and Hengist as their leaders.
Three Pack-Horses of the Island of Britain

Black, horse of Brwyn, son of Cunedda; Huge-Yellow, horse of Pasgen, son of Urien; and Dun-Grey, horse of Rhydderch Hael.
Three Peers of Arthur's Court

The Triad lists Dalldav as one of the peers.
Three Pillars of Battle of the Island of Britain

Dunawd Fur, son of Pabo Pillar of Britain; Gwallawg, son of Lleenawg; and Cynfelyn Drwagl.
Three Plundered Horses of the Island of Britain

Cloven-Hoof, horse of Owain, son of Urien; Long-Tounge, horse of Cadwallawn, son of Cadfan; and Bucheslom, horse of Gegawn of the Red-Sword.
Three Powerful Shepherds of the Island of Britain

Riueri, son of Tanwn; Dunawd the Shepherd; and Pryder ('Care'), son of Dolor ('Grief') of Deira and Bernica.
Three Powerful Swineherds of the Island of Britain

Drystan, son of Tallwch, who guarded the swine of March, son of Meirchiawn, while the swineherd went to ask Essyllt to come to a meeting with him. And Arthur was seeking one pig from among them, either by deceit or by force, but he did not get it; and Pryderi, son of Pwyll, Lord of Annwn, who guarded the swine of Pendaran Dyfed in Glyn Cuch in Emlyn; and Coll, son of Collfrewy, who guarded Henwen, the sow of Dallwyr Dallben, when about to bring forth her litter, went to Penrhyn Awstin in Cornwall, and from there she went into the sea. And at Aber Tarogi in Gwent Is Coed she came to land.

And Coll son of Collfrewy with his hand on her bristles wherever she went, whether by sea or by land. And in Gwent she brought forth a grain of wheat and a bee; and therefore that place is the best for wheat and bees. And from there she went to Llonion in Pembroke, and there she brought forth a grain of barley and a bee. From thence she made for the Hill of Cyferthwch in Eryri; there she brought forth a wolf-cub and a young eagle. And Coll son of Collfrewy gave the eagle to Brennach the Irishman of the North, and the wolf he gave to Menwaedd son of Arllechwedd; and these were the Wolf of Menwaedd and the Eagle of Brennach.

And from thence she went to the Black Stone in Llanfair in Arfon, and there she brought forth a kitten; and Coll son of Collfrewy threw that kitten into Menai. And she was afterwards Palug's Cat.
Three Principal Enchanters

Styled "Men of Illusion and Phantasy". Math ab Mathonwy, who declared his illusion to Gwdion the son of Don; Menyw, son of Teirgwaedd, who taught his illusion to Uthyr Pendragon; and Rhuddlwm the Giant, who learnt his illusion from Eiddilig the Dwarf, and Coll the son of Collfrewi.
Three Prominent Cows of the Island of Britain

Speckled, cow of Maelgwn Gwynedd; Grey-Skin, cow of the sons of Eliffer of the Great War-Band; and Cornillo, cow of Llawfrodedd the Bearded.
Three Prominent Oxen of the Island of Britain

Yellow Pale-White; Chestnut, ox of Gwylwylyd; and the Speckled Ox.
Three Prostrate Chieftains of the Island of Britain

The reason of why they are called 'Prostrate Chieftains' is because they would not seek dominion - something that could not be denied them. They should probably be called 'Subdued by Misfortune'.

They were: Llywarch Hen, the son of Elidir Llydanwyn; Manawydan, son of Llyr Half-Speech; and Gwgon Gwron, son of Peredur, son of Eliffer of the Great Retinue.
Three Queens, Gate of the

During Arthur’s coronation in Tennyson’s Idylls, sunlight shining through a stained-glass window falls upon the three queens who, Merlin foretells, will bear Arthur’s body to Avalon after the final battle. Merlin etched their images above a portal at Camelot, which became known as the Gate of the Three Queens. The queens are unnamed by Tennyson, but one of them, traditionally, is Morgan le Fay.
Three Red Ravagers of the Island of Britain

Arthur; Rhun, son of Beli; and Morgant the Wealthy.
Three Red-Speared Bards of the Island of Britain

Tristfardd, bard of Urien; Dygynnelw, bard of Owain, son of Urien; and Afan Ferddig, bard of Cadwallawn, son of Cadfan.
Three Roving Fleets of the Island of Britain

The Fleet of llawr, son of Eiryf; Fleet of Divwng, son of Alan; and the Fleet of Solor, son of Murthach. Llawr mab Eiryf is said to be a owner of one of the fleets.
Three Royal Knights of the Island of Britain

One of them were Nascien, the son of the King of Denmark.
Three Seafarers of the Island of Britain
Three Who Had The Command of the Fleets of the Island of Britain

Geraint, son of Erbin; Gwenwynwyn, son of Naf (Naw); and March, son of Meirchiawn. The Triad no. 14 names Gwennwynwyn as one of the seafarers. The Triads alos mentions Ligessauc (Ligessac) as one of these companions.
Three Silver Shields

These shields were marked with one, two, and three red bands respectively. The French Damsel of the Lake sent them to Lancelot when he was conquering La Dolorous Garde. The shields were to renew, double, and treble his strength when he used them.
Three Slaughter-Blocks of the Island of Britain

Gilbert, son of Cadgyffro; Morfran, son of Tegid; and Gwgawn Red-Sword.
Three Sovereigns of Arthur's Court
Three Chieftains of Arthur's Court

Goronwy (Gobrwy), son of Echel Vorddwytwll (Mighty-Thigh); Cadriet (Cadreth) 'Fine-Speech, son of Porthawr Gadw; and Fleudur Fflam, son of Godo.
Three Supreme Prisoners of the Island of Britain
Three Exalted Prisoners of the Island of Britain

Llyr Llediaith, in the prison of Euroswydd Wledig, (Lady Guest believes this name to probably be Ostorius, the Roman commander) and Mabon (Madoc) the son of Modron, and Geyr (Geiryoed) the son of Geyrybed, and one more exalted than the three, and that was Arthur, who was for three nights in the Castle of Oeth and Anoeth, and three nights in the prison of Wen Pendragon, and three nights in the dark prison under the stone - And one youth released him from these three prisons; that youth was Goreu the son of Custennin, his cousin.

(The Castle of Oeth and Anoeth is spoken of in the Mabinogion and in another series of the Triads it is named as the prison of the above-mentioned Geyr. In this version, Arthur is not alluded to, but all the members of the families of the other prisoners are said to have shared their captivity, which is designated as the most complete ever known to have taken place).
Three Tribal Herdsmen of the Island of Britain

Llawnrodded Varvawc who tended the kine of Nudd Hael, the son of Senyllt, in whose herd were twenty-one thousand milch cows; and Bennren, who kept the herd of Caradawc the son of Bran and his tribe, in Gorwenydd in Glamorganshire; and Gwdion the son of Don, who kept the herd of the tribe of Gwynedd, above the Conwy.
Three Tribal Thrones of the Island of Britain

Arthur (Chief Prince in Mynyw), Dewi (Chief Bishop), and Maelgwn Gwynedd (Chief Elder).
Arthur (Chief Prince in Celliwig, Cornwall), Bishop Bytwini (Chief Bishop, and Caradawg Strong-Arm (Chief Elder).
Arthur (Chief Prince in Pen Rhionydd, Morth), Gerthmwl Wledig (Chief Elder), Cyndeyrn Garthwys (Chief Bishop).
Three Tribe Herdsmen of the Island of Britain

They were Llawfrodedd, Bennren, and Gwdion. They all attended herds with twenty-one thousand milk cows.
Three Unfortunate Assassinations of the Island of Britain

Heidyn, son of Enygan, who slew Aneirin of Flowing-Verse, Prince of Poets; Llawgad Trwm Bargod Eidyn ('Heavy Battle-Hand of the Border of Eidyn') who slew Afaon, son of Taliesin; and llofan Law Ddifo ('Ll. Severing Hand') who slew Urien, son of Cynfarch.
Three Unfortunate Counsels of the Island of Britain

To give place for their horse's fore-feet on the land to Julius Caesar and the men of Rome, in requital for Meinlas (Meinlas is the horse bestowed on Caswallawn in triad 38); and the second: to allow Horse and Hengist and Rhonwen into this Island; and the third: the three-fold dividing by Arthur of his men with Medrawd at Camlann.
Three Unfortunate Hatchet-Blows of the Island of Britain

The Blow of Eidyn on the Head of Aneirin; the Blow on the Head of Golydan the Poet; and the Blow on the Head of Iago, son of Beli.
Three Unrestrained Ravagings of the Island of Britain
Three Unrestricted Guests of Arthur's Court
Llywarch Hen; Llemenig; and Heledd.
Three Violent Ones of Britain
The Triads says Llemenig and Heledd, Welsh warriors, were two of the three "violent ones" of Britain.
Three Wanderers of Arthur's Court
Llywarch Hen; Llemenig; and Heledd.
Three Well-Endowed Men of the Island of Britain
Three Learned Men of the Island of Britain

Gwalchmai, son of Gwyar; Llachau, son of Arthur; and Rhiwallawn Broom-Hair.
Three Wild-Spectres of the Island of Britain
The Spectre of Banawg; the Spectre of Ednyfedawg the Sprightly; and the Spectre of Melen.
Three Women Who Received the Beauty of Eve

Diadema (Dido?), mistress of Aeneas White-Shield; Elen the Magnificent, the woman on whose account was the destruction of Troy; and Polixena, daughter of Priam the Old, king of Troy.

Nightbringer.se

The Legend of King Arthur

Three