How to become king Arthur

I am a girl. I was born in the late 5th century. My mother died when I was young leaving me to be raised by my 6 older brothers who taught me to have a passion for horseback riding, battle strategizing and sword fighting. My name is Ara Fitzpaula. But you do not know me by that name. You know me by the name of Arthur. King Arthur to be exact. Cover credit goes to wall-height.com