Sir. Mordred(Jak)

Mordred is a member of the Knights of the Round Table, nicknamed the Knight of Treachery, and is the illegitament daughter of Artoria Pendragon and Sir. Lancelot, but was raised as a boy her entire life with the hope of being able to inherit the throne. Mordred led a rebellion against King Arthur, which is what gave her the nickname that she's known as. The Knights of the Round Table who joined her were Sir. Tristan, Sir. Gaheris, and Sir. Gareth, the only one of the four regretting it by his death being Sir. Tristan. Mordred was the third most skilled Knight in the entire kingdom, third only to Lancelot and Artoria themselves. Mordred was the final Knight who fought in the war to die, being slain by Artoria herself on the battlefield.