Cyllarus was a beautiful young centaur who attended the Lapith king Pirithous' wedding with other centaurs. Hylonome, one of the few female centaurs was in love with him. Cyllarus was wounded by a spear in the battle and died in the arms of his beloved. In her despair Hylonome killed herself by throwing herself onto the same spear that had pierced her partner.
Story of Hylonome and Cyllarus
on Zane Stein's site Chiron and Friends