"There are many important dates in the history the Middle Ages, but some notable ones were the issuance of the Papal Bulls and, in this instance, those issued for and against the medieval Knights Templar. A Papal Bull is a formal proclamation or order issued by the Pope and the use of "bull" is derived from the lead seal or "bulla" that is appended to the end of the order to authenticate it. Originally a Papal Bull was used for normal communications, but would evolve and used for formal and important occasions.