Paul never viewed himself as catholics view the "pope".
Oh, OK. You're talking about the pope specifically?
I found this:
Old English, via ecclesiastical Latin from ecclesiastical Greek papas bishop, patriarch, variant of Greek pappas father.Interestingly enough, the Vizier of the ancient Davidic Kingdom, which is the Old Testament type for the papacy, is described "as a father to the inhabitants of Jerusalem, and to the house of Juda." (See Isaiah 22)