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The Donation of Constantine (Latin, Constitutum Donatio Constantini or Constitutum domini Constantini imperatoris) is a forged Roman imperial edict devised probably between 750 and 850. Its precise purpose is not entirely certain, but it was clearly a defense of papal interests, perhaps against the claims of either the Byzantine Empire, or the Frankish king Charlemagne, who had assumed the former imperial dignity in the West and with it the title "Emperor of the Romans". The earliest date is the most probable, and it is often said that the document could have been written during the papacy of Stephen II, around 752. The Donation is included among the texts of the False Decretals of Isidore.
Purportedly issued by the fourth century Roman Emperor Constantine I, the Donation grants Pope Sylvester I and his successors, as inheritors of St Peter, the dominion over the city of Rome, Italy, and the entire Western Roman Empire, while Constantine would retain imperial authority in the Eastern Roman Empire from his new imperial capital of Constantinople. The text claims that the Donation was Constantine's reward to Sylvester for instructing him in the Christian faith, baptizing him and miraculously curing him of leprosy. It has been suggested that an early draft was made shortly after the middle of the eighth century in order to assist Pope Stephen II in his negotiations with Pepin the Short, the Frankish Mayor of the Palace. In 754, Pope Stephen II crossed the Alps to anoint Pepin king, thereby enabling the Carolingian family to supplant the old Merovingian royal line. In return for Stephen's support, Pepin apparently gave the Pope the lands in Italy which the Lombards had taken from the Byzantine Empire. These lands would become the Papal States and would be the basis of the Papacy's secular power for the next eleven centuries.
Inserted among the twelfth-century compilation known as the Decretum Gratiani, this document continued to be used by medieval popes to bolster their claims for territorial and secular power in Italy. It was widely accepted as authentic, although the Emperor Otto III denounced the document as a forgery. The poet Dante Alighieri lamented it as the root of papal worldliness in his Divine Comedy. However, by the mid 15th-century, with the revival of Classical scholarship and textual critique, the Church had begun to realize that the document could not possibly be genuine. The Italian humanist Lorenzo Valla proved in 1440, in his treatise De falso credita et ementita Constantini donatione, that the Donation must be a fake by analyzing its language, and showing that while certain imperial-era formulas are used in the text, some of the Latin in the document could not have been written in the fourth century. Also, the purported date of the document is inconsistent with the content of the document itself as it refers both to the fourth consulate of Constantine (315) as well as the consulate of Gallicanus (317). More recently, scholars have further demonstrated that other elements, such as Sylvester's curing of Constantine, are legends which originated at a later time. Its recent editor[1] has affirmed that at the time of the composition of Valla's work, Constantine's alleged "donation" was no longer a matter of contemporary relevance in political theory and that, rather, it furnished the theme for a brilliant exercise in legal rhetoric. Contemporary opponents of papal powers in the Peninsula emphasized the primacy of civil law and civil jurisdiction, now firmly embodied once again in the Justinian Corpus Juris Civilis. In the very year of Valla's treatise, according to the Florentine chronicler Giovanni Cavalcanti, in diplomatic overtures made by Filippo Maria Visconti, duke of Milan, toward Cosimo de' Medici in Florence, proposing an alliance in common defense against the Pope, as sovereign lord of the Marche, where Francesco Sforza was currently protected by papal sovereignty, Visconti used the words, "It so happens that even if Constantine consigned to Sylvester so many and such rich gifts— which is doubtful, because such a privilege can nowhere be found— he could only have granted them for his lifetime: the Empire takes precedence over any lordship." Civil law was the Emperor's prerogative, according to the Imperial vassal Visconti: "and for this reason you see why the Church is without civil law."[2]
Valla's refutation was taken up vehemently by scholars of the Protestant Reformation, such as Ulrich von Hutten and Martin Luther. For a detailed, account of textual forgery in the early Christian Church, see: Wheless, Joseph, 'Forgery In Christianity, (Moscow, Idaho, USA. 1930),reprint (1990).Aslo, McCabe, Joseph, 'A History Of The Popes',(Watts & Co,1939).