Aleister Crowley (12 October 1875 – 1 December 1947) was an English occultist, philosopher, ceremonial magician, poet, painter, novelist and mountaineer. He founded the religion of Thelema, identifying himself as the prophet entrusted with guiding humanity into the Æon of Horus in the early 20th century. A prolific writer, he published widely over the course of his life.