Rider's True Name is Alexander the Great, the King of Conquerors (征服王, Seifuku-Ō), summoned as the child aspect known by the name Alexander (アレキサンダ, Arekisanda) rather than the adult aspect known as Iskandar. Known by many names, Alexander, Iskandar, and Alexandros, he was the young prince of the small kingdom of Macedonia in the 4th Century BC, said to have been the son of Zeus in many stories despite absence of clear evidence. He was known as a "peerless pretty boy" who was noticed by many sages, such as Aristotle, as a prodigy. During this period of his life, he spent much of his time training as a soldier, studying philosophy and political sciences, and reading great legends. While he bloomed with many talents, he approved of every and all possibilities, able to be called the "personification of possibilities" itself. He possessed a close friend, an "amazing man" who truly began to show his talents after Alexander's death, who would often drag him around rambunctiously in a manner to his later encounter with Taiga Fujimura, expanding Alexander's horizons thanks to his actions. Though considered beautiful, his self-recognition in being the child of Zeus granted him strength, reducing his boyish looks over time. He later encountered the Gordian Knot, cleaving the rope with his sword and taking the divine bulls offered to Zeus by King Gordius as his own for use with his chariot.

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