Edith Stein (religious name Teresa Benedicta a Cruce OCD; also known as St. Teresa Benedicta of the Cross; 12 October 1891 – 9 August 1942), was a German Jewish philosopher who converted to Roman Catholicism and became a Discalced Carmelite nun. She is canonized as a martyr and saint of the Catholic Church.
Read about Edith Stein in Wikipedia