Pope Leo XIV made history as the first American-born pope. From Leo the Great to Leo XIII, here’s a look at the regnal name’s historical significance.© Getty Images ...

The first Pope Leo was canonized a saint because, according to lore or legend, he met Attila the Hun and persuaded the ruthless invader of Europe to spare Rome.

Leo XIV: Portrait of the First American Pope, went on sale today. The biography, published by the Catholic channel EWTN, was written by historian Matthew Bunson, VP and editorial director for EWTN.