I read about him. He fought for the Portuguese, in the Mideast and elsewhere, like India, as the slave of the catholic church. He became some bishop's bodyguard. He was later gifted to a Japanese Lord and his fighting skills earned him the honor of Samuri.

It's a great story. Netflix did an ok anime of the story. It was an anime, so monsters and robotic stuff in Feudal Japan - far from historic. I was happy with the show because people, especially black people could look up the real guy.
There are a few books on the subject.