Mordred, also known as Saber of “Red” (“赤”のセイバー, “Aka” no Seibā), is the Saber-class Servant of Kairi Sisigou of the Red Faction in the Great Holy Grail War  of  Fate/Apocrypha.

The The Knight of Treachery , and the “son” of King Arthur, but she is actually female despite being raised as the secret male heir to the throne. She became known as a “rare villain” who managed to tarnish a glorious legend at the end of her life.

She was conceived between Artoria and her sister, Morgan le Fay, through unorthodox circumstances. Artoria, normally female, was a pseudo-male at the time due to Merlin’s magecraft in order to consummate her marriage with Guinevere. During this time Morgan enchanted Artoria with a spell to extract sperm from her. Morgan developed it within her own ovary, and made the child into a homunculus clone of Artoria. Due to her status as a homunculus, she was given a much faster growth period than a regular human being, and her life span was far shorter. She was raised in secret and told to hide her status and obey the king until the time was right.