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Edward Irenaeus Prime-Stevenson (January 29, 1858, Madison, New Jersey – July 23, 1942, Lausanne, Switzerland) was an American author. He used the pseudonym Xavier Mayne.
Edward Prime Stevenson was born on January 29, 1858, in Madison, New Jersey. His father was a Presbyterian minister and a school principal; his mother was the offspring of a family of men of letters.
After studying law, Stevenson decided to become a writer and a journalist. In 1901 he moved to Europe, living in Florence and Lausanne, where he died of a heart attack in 1942.
In 1896 Stevenson published The Square of Sevens, and the Parallelogram: An Authoritative Method of Cartomancy with a Prefatory Note by Robert Antrobus that was supposedly written in 1735. However, it is believed that he was the author.
In 1906, under the pseudonym Xavier Mayne, Stevenson published the homosexually themed novel Imre: A Memorandum, and in 1908 a sexology study, The Intersexes, a defense of homosexuality from a scientific, legal, historical, and personal perspective.