Document of Constantine

The Document of Constantine or C-Document (C文書) was a magical scroll that belongs to the Roman Catholic Church. Its power was "to make whatever the Pope says seem to be the absolute truth", and was the cause of a large amount of general unrest around the world directed towards Academy City.

Background
The C-Document is a magical item which grants the current-ruling Pope the powers of absolute obedience to the entire Roman Catholic population; whatever the Pope says while the C-Document is activated will be registered into every Roman Catholic around the world, and the Pope's statement will be treated by the people as a proven fact.

However, there are limitations to activating the C-Document's magical effects. First, the C-Document cannot apply its powers to two statements at the same time, implying a certain cooldown time between usage. Second, whatever the Pope wishes to be put under the power of the C-Document must be approved by all of the cardinals of the Roman Catholic Church, and this tedious process lengthens the usage time for the C-Document.

Document of Constantine Arc
The pope of the Roman Catholic Church uses the C-Document to cause widespread unrest throughout the world, stating that the enemy of the Roman Catholics is Academy City. As a result, news of anti-Academy City protests erupted in different parts of the world, especially Europe. In order to stop the civil unrest caused by the pope's statement, the Amakusa Catholics, and later Kamijou Touma and Tsuchimikado Motoharu, plan to retrieve the C-Document before it could be used again.

After intense battles against God's Right Seat's Terra of the Left and escaping the mobs created by the C-Document's magical effect, Touma, Amakusa Catholics' Itsuwa and Tsuchimikado manage to find and destroy the C-Document.

Ultimately, the destruction of the C-Document rendered the Roman Catholic Church with one more powerful weapon less after the destruction of the Croce di Pietro and the destruction of the monk choir who is in charge of performing the Gregorian Chant.

Trivia
A similar piece of documents relating to the Holy Roman Emperor Constantine I, the "Donation of Constantine", supposedly transferred authority over Rome and the western part of the Roman Empire to the pope. This, however, is a forgery dating between the 8th and 9th Centuries CE.