Four entries with the name Brian.
Any of the Brians may be literary descendants of the Welsh Bran.
Brian
Briien
A Knight of the Round Table found in Hartmann von Aue’s Erec.
He may be identical to one of the other Brians.
Sources
Erec | Hartmann von Aue, late 12th century
Diu Crône | Heinrich von dem Türlin, c. 1230
Brian
Brien
Brother of the Arabian warlord Larner. He killed his brother for a magnificent suit of armor, which he then brought to the country of Korntin. It eventually fell into the hands of Gawaine’s son, Wigalois.
Source
Wigalois | Wirnt von Grafenberg, early 13th century
Brian
An Arthurian knight who participated in the Roman War.
Source
Alliterative Morte Arthure | c. 1400
Brian
Bryan
A Knight of the Round Table from Listenois.
He was liberated from the dungeon of Lord Tericam (Turquine) by Lancelot.
Source
Le Morte Darthur | Sir Thomas Malory, 1469-1470