Saint John Leonardi
Good Saint Pope John XXIII - His Many Hats

Saint Francis Borgia

Yes, those Borgias. If I am reading the family tree correctly, he was the great-grandson of Pope Alexander VI. Francis enjoyed great success in the royal and ecclesiastical politics of the day, marrying a Portuguese noblewoman and becoming a close advisor to the Holy Roman Emperor. Upon the death of his wife after more than a decade of marriage and eight children, he decided to renounce his royal succession and become a Jesuit priest.

His ascent in the Jesuits was no less notable. He was eventually elected the third Father General of the Order after Ignatius. His administrative skills were put to worthy use by the Jesuits though he was still sought for counsel by kings and popes. Francis, however, preferred a quiet life of prayer. He founded a school in Rome which would eventually become the Gregorian University.