Galahad was the natural son of Launcelot. His name may be of Welsh origin or come from the place name Gilead in Palestine. His mother was Elaine, and he was placed in a nunnery as a child, being that the abbess there was his great aunt.
One day a sword in a stone was seen in a river by Arthur's knights, and it was said that only the world's best knight could pull out the sword. Galahad was led into Arthur's court where he sat in the Siege Perilous and then drew the sword out. It was later on when the Grail appeared in a vision at Arthur's court that Galahad was one of the three knights chosen to undertake the Quest for the Holy Grail. He was given a white shield, made by Evelake, with a red cross which Joseph of Arimathea had drawn in blood. In the course of the Quest he joined up with Percivale, Bors, and Percivale's sister. On board Solomon's ship, Galahad obtained the Sword of David, and after the death of Percivale's sister the trio split up for a while and Galahad traveled with his father, Launcelot.
When the three rejoined forces they came to Carbonek and achieved the Grail. Galahad mended the broken sword, and therefore, He was allowed to see the Grail. After beholding the Holy Grail, Galahad requested of Joseph of Arimathea that he die, which request was granted unto him. Galahad was always known as the "Perfect Knight". He was "perfect" in courage, gentleness, courtesy, and chivalry.