The new Chicago-raised Pope Leo XIV faces an immediate challenge in his native country: taming the brawling U.S. tribe of Catholics, riven by political divisions that have thwarted the will of his predecessors.

Pope Leo I tangled with Attila the Hun and won. Pope Leo III crowned Charlemagne as the first Holy Roman Emperor. This is the history of a legendary papal namesake.

As Pope Leo XIV stepped out in front of cheering crowds outside of St. Peter’s Basilica to give his first speech as head of the Holy See, experts took note of a few subtle clues that may reveal what direction the Catholic Church will go under his leadership.