The Document of Constantine (文書のコンスタンティヌス Bunsho no Konsutantinusu?), or simply known as the C-Document (C文書 C-Bunsho?) is a magical artifact that belongs to the Roman Catholic Church. Its power was "to make whatever the Pope says seem to be the absolute truth." During the events of the Academy City invasion of Avignon, Kamijou Touma destroys the artifact with the Imagine Breaker.