With Sir Bedivere and King Arthur, he helped kill the Giant of Mont Saint Michel. Stories vary in how they depict his character: some picture him as Arthur's honorable and faithful steward, others describe him as mean spirited or even traitorous.
It is not known for certain how he died, but many accounts involve the battle against Mordred and some blame Gwyddawg.
One of the earliest knights in the stories of King Arthur, he is linked to the real-life Lord of Caer Goch.