Edith Stein
Edith Stein (religious name Teresia Benedicta a Cruce; also known as St. Edith Stein or St. Teresa Benedicta of the Cross; 12 October 1891 – 9 August 1942) was a Jewish-born philosopher who converted to Catholicism and became a nun. She is canonized as a martyr and saint of the Catholic Church, because she supposedly miraculously cured a little girl who had been poisoned and because of she is stated to have died in the Auschwitz camp. She has been proclaimed one of six "patron saints of Europe", all the other five being long-term very famous saints.
Possibly surprising for the Catholic Church, advocates of Jewish Holocaust uniqueness have actually criticized this, claiming that she was sent to Auschwitz only because of her Jewish ancestry and that this was completely unrelated to the public condemnation of National Socialism by the Dutch Catholic Church, which the Catholic Church used as justification for making her a martyr. See also the "External links" section regarding this and other controversies.