Pacific
He's a pacific human being even though his past is not the happiest one.

Pacifist
I've met a lot of pacifists but who are always ready to protect their families no matter how.

Pacify
Everytime I see people fighting I try to pacify them before doing something which might regret sooner or later.

Pax Americana
More countries should take the example of Pax Americana and protect themselves.