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750 CE
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751 CE - 756 CE: Probable dates for the composition of the forgery known as The Donation of Constantine by the Roman Catholic Church.
753 CE: Possible first use of The Donation of Constantine in coercing Pepin the Short to donate his lands to the Church.
778 CE: First documented use of The Donation of Constantine by Pope Adrian I trying to coerce Charlemagne.
1054 CE: Most dramatic use of The Donation of Constantine by Pope Leo IX to justify Church's supremacy and involvement in temporal affairs.
1439 CE - 1440 CE: The Donation of Constantine proven a forgery by priest and scholar Lorenzo Valla.