1. Turquine
      Tarquin, Tarquine, Tericam, Terican, Tericans, Teriquam, Teriquan, Terique, Terrican, Terrigans, Terriguan, Terriquan, Terriquans, Tiriguan

      While seeking Lancelot and adventures, Sir Ector de Maris asked a forester if there were any of the latter nearby.

      Sir, said the forester ... within this mile, is a strong manor, and well dyked, and by that manor, on the left hand, there is a fair ford for horses to drink of, and over that ford there groweth a fair tree, and thereon hang many fair shields that wielded sometime good knights, and at the hole of the tree hangeth a basin of copper and latten [brass], and strike upon that basin with the butt of thy spear thrice, and soon after that thou shalt hear new tidings, [or] else hast thou the fairiest grace that many a year had ever knight that passed through this forest.

      Ector thanked the forester and followed his instructions. Forth came Sir Turquine and bade Ector make ready. Ector began well, striking Turquine such "a great buffet that his horse turned twice about". Turquine, being a strong knight of great prowess, quickly turned the tables and took Ector prisoner back to his own hall. In honor of Ector's having put up the best fight of any opponent in twelve years, Turquine offered to give him his life in exhange for Ector's promise to remain his prisoner for said life's duration. When Ector refused these terms, Turquine had him stripped and beaten with thorns before throwing him into the deep dungeon with the other prisoners, "three score and four", including some of the Round Table.

      Sir Lancelot was guided in his turn to Turquine by a damsel who remarked that she knew of no one else who might conquer the villainous knight. After a battle of two hours, Turquine, much impressed by Lancelot's prowess, asked his name, offering him friendship and the free release of all the prisoners on condition that the stranger was not the one knight whom Turquine hated above all others. Lancelot asked which was the hated knight.

      Faithfully, said Sir Turquine, his name is Sir Launcelot du Lake, for he slew my brother, Sir Carados, at the dolorous tower, that was one of the best knights alive; and therefore ... may I once meet with him, the one of us shall make an end of other, I make mine avow. And for Sir Launcelot's sake I have slain an hundred good knights, and as many I have maimed all utterly that they might never help themsevles, and many have died in prison, and yet have I three score and four.

      Lancelot announced who he was. "Ah", said Turquine, "Lancelot, thou art unto me most welcome that ever was knight, for we shall never depart till the one of us be dead." It seems almost superfluous to report that Turquine was the one who was left dead.

      Sommer standardizes Turquine's name as Terican in the Vulgate, where the tale differs in a few details.

    2. Turquine's Hill
      Terican's Hill

      Turquine was the brother of Sir Carados of the Dolorous Tower, but in the Vulgate it appears that he did not help keep the Dolorous Tower. Instead, he had his own collection point for vanquished opponents on the hill named for him. Near this hill was a fountain running through a silver tube onto a marble slab and thence into a leaden vessel.

      The fountain was overshadowed by three pines on which hung the shields, helmets, and lances of the knights Terican had conquered. When Sir Ector de Maris arrived, there were sixty shields, including twenty-four belonging to knights of Arthur. Also near or more likely on the hill was a stronghold where Terican kept his prisoners. After Lancelot killed Terican, Arthur's knights gave the property to one Count del Parc.

      The Fountain with the Silver Pipe sounds suspiciously similar to that fountain near which Morgan caused Sir Accolon to awake. This fountain was near the castle of Sir Damas, which was two days' journey from Camelot - all of which may help to locate Turquine's Hill and his brother's Dolorous Tower.

      Between Castle Cary and Yeovil, on the escarpment of the oolite, abuting on the plain which extends to Ilchester, is Cadbury, 'a hill of a mile compass at the top, four trenches encircling it, and twixt every of them an earthen wall; the content of it, within about twenty acres full of ruins and reliques of old buildings ... In the fourth ditch is a spring called King Arthur's Well.

      Cadbury is considered a candidate for Camelot, but it sounds like a fine site for Turquine's Hill, with King Arthur's Well as the "Fountain of the Silver Pipe". Yeovil appears to be right on the southern border of Somersetshire and Dorsetshire, which might put it in the Arthurian South Marches.