The Bishop of Troyes.

Pope Romanus sent Louis and Saint Germanus to Britain, at the request of King Vortimer, to repair the Christianity had been damaged by King Vortigern.

At the "Church of the Tombs", Lancelot found the tomb where Louis would lie. It waited with, possibly between, the tombs ready-inscribed for Gawaine and Ywaine. This suggests that Sir Louis must have been a knight of no small renown.