Pelles, king of Listenois, brother of Pellinor and Alain, all three the sons of Pellehem. (The Vulgate Version of the Arthurian Romances, 1916)

... The Fisher King was certainly the uncle of the original Grail Winner, and King Pelles is as certainly the grandfather of Galahad. (The Legend of Sir Lancelot du Lac, Weston, 1901)

    Pelles (Sir), of Corbin Castle, "king of the foragn land and nigh cousin of Joseph of Arimathy."  He was father of sir Eliazar, and of the lady Elaine who fell in love with sir Launcelot, by whom she became the mother of sir Galahad "who achieved the quest of the holy graal."  This Elaine was not the "lily maid of Astolat."
    While sir Launcelot was visiting king Pelles, a glimpse of the holy graal was vouchsafed them:  "For when they went into the castle to take their repast... there came a dove to the window, and in her bill was a little censer of gold, and there withall was such a savour as though all the spicery of the world had been there... and a damsel, passing fair, bare a vessel of gold between her hands, and thereto the king kneeled devoutly and said his prayers... 'Oh mercy!' said sir Launcelot, 'what may this mean?'... 'This,' said the king, 'Is the holy Sancgreall which ye have seen.'"—Sir T. Malory, History of Prince Arthur, iii. 2 (1470). (The Reader's Handbook of Famous Names in Fiction, &c., Brewer, v.1, 1899)