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Saber's True Name is Artoria Pendragon, better known as Arthur Pendragon and King Arthur, who is regarded as a male in history. She is the "Once and Future King" and a legendary hero of Britain known as the King of Knights (騎士王, Kishi-Ō). She wielded the sword from the stone, Caliburn, but it was eventually destroyed. She later obtained Excalibur and Avalon from the Lady of the Lake.

While Arthur is a hero well known as a model for knights, it is said that he actually existed as "Dux Bellorum", the leader of War, and was a great general who led the twelve kings of Northern England, Gododdin, while preventing foreign invasion from forces such as the Scottish and the Picts. This identity of the real great leader behind the legend of King Arthur has many variations, and it is thought that there may have been two people who fit the description of the king. One is the full Briton Arthur, while the other is the Roman Arturius, and their two separate sets of accomplishments are said to have merged into the legend of King Arthur that is known in the present time.