Document concerning the supposed grant by the emperor Constantine I (the Great) to Pope Sylvester I (314–335) and later popes of temporal power over Rome and the Western Empire.
The gift was said to have been motivated by Constantine's gratitude to Sylvester for miraculously healing his leprosy and converting him to Christianity. Based on legends from the 5th century concerning Sylvester and Constantine, the Donation was probably written at Rome in the mid 8th century and was related to the coronation of Pippin III , the first Lorenzo Valla to be a forgery, the document was already questioned by the emperor {{link=Otto">Otto III (r. 996–1002) but was often cited in the 11th–15th centuries to support papal claims in the struggle between church and state.