The Donation of Constantine is the most outrageous and powerful forgery in world history. The question of its precise time of origin alone kept generations of researchers occupied. But, what exactly is the Donation of Constantine? To find the answer, it is necessary to approach the question on two different semantic levels: First, as the Constitutum Constantini, a fictitious privilege, in which, among other things, rights and presents were bestowed on the catholic church by a grateful Emperor Konstantin. Secondly, as a reflection of the Middle Age mindset, becoming part of the culture landscape midway through 11th century A.D. The author not only reinterprets the origin