Josep, Joseph, Josephs, Josex
In Perlesvaus, the son of King Pelles.
His mother told him that he would be a monk rather than a king, which made Joseus so angry that he killed her. He spent the rest of his life as a hermit, doing penance for this crime, although he would have been a great knight. Lancelot helped him clear his forest of robber knights.
Joseus picked up arms only once, to help Perceval re-conquer the Grail Castle from the evil King of the Castle Mortal. He became the caretaker of the Grail Castle and died there.
Source
Perlesvaus | Early 13th century