Biographies
The Last Crusader: Isabella of Spain
Queen Isabella (the Catholic) of Spain is one of the most influential and controversial women in history. She and her husband were responsible for supporting Columbus' voyages to the New World, the re-conquering of all of Spain from the Moors, the expulsion of the Jews, and the establishment of the Spanish Inquisition. Her daughter, Catherine of Aragon, was the unfortunate first wife of King Henry VIII of England (who founded the Anglican church because he didn't accept the Pope's refusal to grant him an annulment of his marriage to Catherine).
How the Reformation Happened
This book is a surprisingly readable and interesting account of "How the Reformation Happened". Although it is written from a Catholic perspective, Mr. Belloc is very fair in dishing out the blame to the appropriate people on both sides. The years covered are 1517 (when Martin Luther affixed his protest against the Indulgences to a church door in Wittenberg, Germany) to 1648, but also includes commentary of the implications of the "Reformation" on our own times.
Saint Catherine of Siena
Saint Anthony and the Christ Child
Saint Athanasius
Jesus of Nazareth
There is no substitute for reading the story of Christ's life in the Gospels themselves.