Wilhelm Emmanuel Freiherr von Ketteler (1811–1877)
Born 1811 CE, died 1877 CE.
Freiherr Wilhelm Emmanuel von Ketteler (25 December 1811 – 13 July 1877) was a German theologian and politician who served as Bishop of Mainz. His social teachings became influential during the papacy of Leo XIII and his encyclical Rerum novarum.
Text from the Wikipedia article Wilhelm_Emmanuel_von_Ketteler, licensed CC BY-SA 4.0.