The Donation Hoax

The Donatio Constantini (Latin: "Donation of Constantine") was a document in which the converted Emperor Constantine, whose Edict of Milan ended Christian persecution, gave the popes authority over the western part of the Roman Empire.

The 5th-century "Legend of St. Sylvester" tells about the relationship between Constantine and Pope Sylvester I. In it, Sylvester cures Constantine of leprosy, who then converts to Christianity. Following this, Constantine grants to Sylvester authority over Rome, Antioch, Alexandria, Constantinople, Jerusalem, and all churches, as well as any estates that are attached to churches. The oldest manuscript of the story is from the 9th century, but it is not until Pope Leo IX (pope from 1049 - 1054) that it gets used to affirm the supremacy of the papacy over temporal lords. It became a valuable tool in the argument, especially with the Holy Roman Emperors, that the pope's decisions and decrees superseded anyone else's. There was plenty of legal opposition to the idea, especially starting with Otto III, but no one denied its authenticity.

Then, in 1440, a Catholic priest named Lorenzo Valla took a close look at the document. He was a specialist in Latin translation, and something about the document did not look right. His familiarity with numerous Latin documents of all types and all times led him to the conclusion that, rather than an official document from the 4th century, it was a poorly written forgery from the 8th century, and therefore a hoax. 

Why was he motivated to chop down the chief pillar of papal authority over secular powers, when he himself as a priest could benefit? He might have had a personal reason, which I will look into and share next time.