Saint Augustine of Hippo - what an interesting philosopher he turned out to be!
He was certainly an interesting man, as well. Set aside his historical importance --- the fact that he above all others brought together the Greek and Hebrew aspects of Christianity, that his work against the heresies of Arianism, Pelagianism and Manicheanism was tireless.
He was a person with one great philosophical skill: he knows how to get puzzled by things, and then thinks hard about what to say about them.