LANCEOR

Son of one of the kings of Ireland [Malory does not specify which], Lanceor was "an orgulous [haughty] knight" of Arthur's court, but not, apparently, of the Round Table, early in Arthur's reign.

Jealous of Balin's success in drawing the sword worn by "Malvis", Lanceor pursued Balin, jousted with him, and was killed. Another source I've found says Arthur sent Lanceor to inflict retribution on Balin for slaying the Lady of the Lake. Balin killed him and his distraught lover Colombe committed suicide. King Mark of Cornwall rode by, saw their bodies and buried them.

Lanceor is mainly memorable for being one of the comparatively few knights with a lady who is named - Colombe - and because their tomb [erected over them, curiously enough, by King Mark] became a kind of landmark when Merlin accurately predicted that Lancelot and Tristram would someday fight each other there.