Saber (セイバー, Seibā) is a Servant of Leonardo B. Harwey in the Moon Cell Holy Grail War of Fate/Extra, and reprises his role in Fate/Extra CCC. Saber's True Name is Gawain (ガウェイン), one of the Knights of the Round Table that appeared in the Arthurian legends, also known as the White Knight of the Round Table (円卓の白騎士). If King Arthur was the night, the symbol of the moon itself, then Sir Gawain was the day, which shoulders the sun. He acted as King Arthur's impersonator in the royal castle of Camelot. In other words, he was one of the candidates to substitute the King after his fall.