Lex Mahumet pseudoprophete (English: "Law of Muhammad the false prophet") is the translation of the Qur'an into Latin by Robert of Ketton. In 1142 Peter the Venerable persuaded Robert to join a team he was creating to translate Arabic works into Latin in hopes of aiding the religious conversion of Muslims to Christianity. The principal work of this collection was to translate the Qur'an, Islam's revealed law, an endeavor marking its first translation into any Western language. The undertaking was huge, taking over a year and filling over 100 folios (180 pages in modern print). This translation of the Qur'an was popular in its time, with over 25 manuscripts still existing, together with two 16th century prints. It was the standard translation for Europeans from its release until the 18th century.