Excalibur those heretics

A legendary king of Britain. Also called the King of Knights.

Artoria is a childhood name and, upon being raised as a king, she began to be called King Arthur.
In an age when chivalry had lost its beauty, with a holy sword in her hands, she brought about a brief moment of peace and final prosperity to Britain.
A man in historical fact, but it seems that in this world she was a cross-dressing beauty.

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Subgroup - Desu!