Sir Galahad was one of the knights of King Arthur's Round Table in Arthurian legend. He was the bastard son of Sir Lancelot and Elaine of Corbenic, and he was renowned for his gallantry and purity.
According to legend, Galahad was one of only two knights to find the Holy Grail (the other being Percival). Upon finding the Grail, Galahad is said to have drunk from it, which killed him instantly and sent him straight to heaven in divine standing.
Sir Galahad's conception came about when Lady Elaine disguised herself as Queen Guinevere, who was Sir Lancelot's true love, and tricked him into bed. Ashamed of what had happened, Sir Lancelot abandoned the child and his mother to go off on foreign adventures. Elaine subsequently died of a broken heart, and young Galahad was placed into the care of his great aunt, who was the abbess at a nunnery where he was reared.
Upon reaching adulthood, Galahad was reunited with his father who knighted him and then brought him along to King Arthur's court at Camelot where the feast of Pentecost was taking place. Without realising the danger he was putting himself in, Sir Galahad walked over to the Round Table and amidst the revelry took his seat at the Siege Perilous. This place had been kept vacant for the sole person who would accomplish the quest of the Holy Grail; for anyone else sitting there it would prove to be immediately fatal. Needless to say, Sir Galahad survived the event which was witnessed by King Arthur and several knights. The king then asked the young knight to perform a test which involved pulling a sword from a stone. This he accomplished with ease and King Arthur swiftly proclaimed Sir Galahad to be the greatest knight in the world. He was promptly invited to join the Order of the Round Table, and it was then decided by the present company that they should embark upon the Quest for the Holy Grail.