Return of the King of Knights

I used to be the King of Knights in my first life. In my boring second life I had no clue who I was, yet I enjoyed Harry Potter and the Fate series. In my new life given to me by a god (the one who gave me that boring second life), I was gifted my weapons from my life as King Arthur and was born into a famous wizard family who were all given a gift which even Voldemort fears.