FTP, name this son of King Pellinore, who along with Bors and Galahad, was one of three to find the Holy Grail.
He overcame Guireomelant, the lover of Clarissant, who is mentioned as Gawain's sister.  His brothers included Lamorak and Aglovale.  He remains in Sarras unlike his companions, and becomes a guardian.  According to one legend, his grandfather Bron was a Fisher King, and that is why he was successful in his quest.  FTP, name this son of King Pellinore, who along with Bors and Galahad, was one of three to find the Holy Grail.
He overcame Guireomelant, the lover of Clarissant, who is mentioned as Gawain's sister.  
Percival