To Kill a King

What would you do if you were the bastard son of a bastard son of a King?

Hidden as a girl from his uncle, Peter meets his father, Harold, for the first time when he is 14 years old. Harold asks Peter if he would like to be trained as a warrior and take over from his despotic uncle.

(this is my first time, so please be gentle!)

Alternate synopsis: Growing up hidden in the castle as a girl to save his life, Peter ends up joining forces with his father to take what's rightfully theirs--> the Kingdom of Borencia.

Being born on the wrong side of the sheets doesn't matter for the Nobles, why should it matter for the King?