From the Papal Coronation rite:
Accipe tiaram tribus coronis ornatam, et scias te esse Patrem Principum et Regum, Rectorem Orbis, in terra Vicarium Salvatoris Nostri Jesu Christi, cui est honor et gloria in sæcula sæculorum.
The term rector in the widest ecclesiastical sense means "one who sets straight, guides, directs; a ruler, governor, director, guide, leader".
Orbis - of the World
Supreme Governor, Legislator of the World. He who can judge and define the law and cannot be judged by anyone, except God Himself.