I’m getting in on this a bit late, but my two highest recommendations would be the following two books:
- Isabel of Spain: The Catholic Queen, by Warren Carroll
- The Last Crusader: A Novel about Don Juan of Austria, by Louis de Wohl
I also would recommend:
- Set All Afire (a novel about St. Francis Xavier), by Louis de Wohl
- Mother Angelica: The Remarkable Story of a Nun, Her Nerve, and a Network of Miracles, by Raymond Arroyo
The two Louis de Wohl books I mentioned are not strictly biographies, but more like fictionalized biographies or biographical novels. As far as I know, the stories are based mainly on true historical facts, but they are also embellished with smaller fictional details, so that they read more like a novel than a biography.
Also, I will put in a caution against Chesterton’s biography of St. Francis. I have heard many good things about it, and I love some of Chesterton’s work myself (especially Orthodoxy, and to a lesser extent The Everlasting Man). But I just couldn’t get interested in Chesterton’s biography of St. Francis. I forced myself to stick with it through about one third of the book, and then I gave up and went on to something else.