The following year he returned to the Bernese Alps, climbing the Eiger, Trift, Jungfrau, Mönch, and Wetterhorn.
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.
He married Rose Edith Kelly and in 1904 they honeymooned in Cairo, Egypt, where Crowley claimed to have been contacted by a supernatural entity named Aiwass, who provided him with The Book of the Law, a sacred text that served as the basis for Thelema.
Announcing the start of the Æon of Horus, The Book declared that its followers should "Do what thou wilt" and seek to align themselves with their True Will through the practice of magick.
Crowley gained widespread notoriety during his lifetime, being a recreational drug experimenter, bisexual and an individualist social critic.
He was denounced in the popular press as "the wickedest man in the world" and a Satanist.