For 10 points, name this son of Lancelot whose extraordinary purity allows him to achieve the Grail.
This man is given a shield by King Evelake which has a cross drawn in blood on it. The sister of one of this man's companions takes him to a ship which only true believers can board, where he finds a sword and crown. He becomes king of the city of Sarras after undertaking a task given to him by Pelles and Eliazar. This man is given the ability to die at the moment he chooses, and ascends to heaven after meeting Joseph of Arimathea. This man is conceived when Elaine of Corbenic tricks his father into thinking she is Guinevere. He's not Percival, but he manages to survive sitting in the Siege Perilous. For 10 points, name this son of Lancelot whose extraordinary purity allows him to achieve the Grail.
This man is given a shield by King Evelake which has a cross drawn in blood on it.
Sir {Galahad} [or {Galath;} or {Galeas;} or {Gwalchavad}]