Edith Stein was born to a Jewish family. Her father died when she was just a toddler. Her mother was Jewish to the core, but not religious. Edith became an atheist and then became a very impressive scholar of philosophy.
While on a vacation, she picked up a book by St. Theresa of Avila. Edith was then convinced that she needed to become a Roman Catholic. Her mother was offended and angry. Edith became a Carmelite sister, her new name became Theresa Benedicta of the Cross (Blessed Theresa of the Cross).
The pogrom against Jewish people was reaching it's peak and even though Edith's order tried to keep her hidden from the Nazi's, she was taken prisoner along with her birth sister and fellow nun. They were killed in a gas chamber a week later.
Edith Stein was canonized many years later by Pope John Paul II. While some view this sainthood as an affront to the Jewish faith, I consider it to be a honor to say this woman practiced heroic virtue in the face of death.