The famous document, known as the Constitutum Constantini and compounded of various elements (notably the apocryphal Vita S.
Bdhmer, who by an ingenious argument endeavours to prove that the Constitutum was forged in 753, probably by the notary Christophorus, and was carried with him by Pope Stephen II.
On one point, however, a fair amount of agreement seems now to have been reached, a result due to the labour in collating documents of Scheffer-Boichorst, namely, that the style of the Constitutum is generally that of the papal chancery in the latter half of the 8th century.
The genuineness of the Constitutum was first critically assailed by Laurentius Valla in 1440, whose De falso credita et ementita Constantini donatione declamatio opened a controversy that lasted until, at the close of the 18th century, the defence was silenced.
Mayer, on the other hand, denies that the Constitutum can have been forged before the news of the iconoclastic decrees of the council of Constantinople of 754 had reached Rome.