YVONET LI AVOUTRES
Uwaine Les Adventurous, Uwaine Les Avoutres, Yvain the Bastard, etc

King Uriens of Gore had two sons of the same name: Yvonet le Grand by Arthur's half-sister Morgan, and Yvonet li Avoutres by the wife of Uriens' seneschal, according to Vulgate II. To try to keep things a little less confusing, I have used the more common present-day variant spelling Ywaine for the legitimate son, Le Grand [also called Le Blanchemains, etc.], and reserved the variant Yvonet for Li Avoutres.

Malory uses both brothers, but does not explain their birth history, which may lead to confusion. Both appear together on at least two occasions, once at the tournament at Castle Dangerous and once in company with Sirs Brandiles, Ozana, Agravaine, and Mordred in one of the interminable mix-and-match adventures that largely make up Malory's books of Tristram. Yvonet, or Uwaine les Avoutres as Malory calls him, was killed by Gawaine, ironically, while they were both on the Grail Quest. Happening to meet, they indulged in a joust, and my misadventure Yvonet was mortally wounded. Gawaine got him to an abbey, where he was unarmed and given the Sacrament.

Then Gawaine asked him what he was ... I am, said he, of King Arthur's court, and was a fellow of the Round Table, and we were brethren sworn together; and now Sir Gawaine, thou hast slain me, and my name is Uwaine les Avoutres, that sometime was son unto King Uriens, and was in quest of the Sangreal; and now forgive it thee God, for it shall ever be said that the one sworn brother hath slain the other.