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Donation of Constantine

Forged Roman imperial decree

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Through Roman Empire, Manuscript and Constantinople

In many of the existing manuscripts, including the oldest, the document bears the title Constitutum domini Constantini imperatoris. The Donation of Constantine was included in the 9th-century Pseudo-Isidorean decretals. Lorenzo Valla, an Italian Catholic priest and Renaissance humanist, is credited with first exposing the forgery with solid philological arguments in 1439–1440, although the document's authenticity had been repeatedly contested since 1001.

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An alleged decree from Roman Emperor Constantine I, dated March 30 and not explicitly stating its year, incorrectly references the co-consul of Constantine I in his fourth term (315) as Gallicanus (317). Historical records confirm that these two never served as consuls together, indicating this as evidence of the document's forged nature. The forged imperial decree states that "Constantine" professes Christianity (confessio) and entitles to Pope Sylvester I several imperial insignia and privileges (donatio), as well as the Lateran Palace. Rome, the rest of Italy, and the western provinces of the empire are made over to the papacy.

The text recounts a narrative founded on the 5th-century Acts of Sylvester. This tale describes the sainted Pope Sylvester's rescue of the Romans from the depredations of a local dragon and the pontiff's miraculous cure of the emperor's leprosy by the sacrament of baptism. The story was rehearsed by the Liber Pontificalis; by the later 8th century the dragon-slayer Sylvester and his apostolic successors were rewarded in the Donation of Constantine with temporal powers never in fact exercised by the historical Bishops of Rome under Constantine.

In his gratitude, "Constantine" determined to bestow on the seat of Peter "power, and dignity of glory, vigor, and imperial honor," and "supremacy as well over the four principal sees: Alexandria, Antioch, Jerusalem, and Constantinople, as also over all the churches of God in the whole earth". For the upkeep of the church of Saint Peter and that of Saint Paul, he gave landed estates "in Judea, Greece, Asia, Thrace, Africa, Italy and the various islands". To Sylvester and his successors he also granted imperial insignia, the tiara, and "the city of Rome, and all the provinces, places and cities of Italy and the western regions".

The Donation sought reduction in the authority of Constantinople; if Constantine I had elevated Pope Sylvester I to imperial rank before the inauguration of Constantinople in 330, then Sylvester, Rome's Patriarch would have had a lead of fifteen years in the contest for primacy among the patriarchates. Implicitly, the papacy asserted its supremacy and prerogative to transfer the imperial seat; the papacy had consented to the translatio imperii to Byzantium by Constantine and it could wrest back the authority at will.

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