Which Catholic saint voluntarily took another prisoner's place in Auschwitz in 1941?

Maximilian Kolbe was the Catholic saint who voluntarily took another prisoner's place in Auschwitz in 1941.

Born Raymond Kolbe in 1894 in Zduńska Wola, Poland, he joined the Order of Friars Minor Conventual and took the religious name Maximilian. He founded the Militia of the Immaculate and established a major Catholic publishing apostolate in Niepokalanów.

During the German occupation of Poland, Kolbe was arrested and eventually sent to Auschwitz. In July 1941, after an escape from the camp, the guards selected ten prisoners to die by starvation as a collective punishment. Kolbe offered to die in place of Franciszek Gajowniczek, a married man with children.

Kolbe and the other prisoners were held in a starvation bunker. He remained alive for about two weeks and was killed by a lethal injection on 14 August 1941. Pope John Paul II canonized him in 1982 as a martyr of charity. The victim he replaced was present at the canonization.