On the 25th December 1066, William of Normandy was crowned King of England at Westminster Abbey. The event ended in chaos as Norman guards outside mistook the sounds of the cheering crowd inside for the start of a riot.
William, having defeated the English king Harold at the Battle of Hastings on the 14th October 1066, was forced to fight on after a number of English nobles nominated Edgar the Ætheling as the new king. When he crossed the Thames at Wallingford in early December he was met by Stigand, the Archbishop of Canterbury, who just a few weeks earlier had elected Edgar as king. However, he immediately abandoned Edgar and submitted to William, who soon marched to Berkhamsted where Edgar himself gave up his claim to the throne.
William’s coronation in Westminster Abbey on Christmas Day saw both Norman and English nobility in attendance. Norman troops were stationed outside the abbey and in the surrounding streets in case of trouble while the coronation itself was conducted by Geoffrey, the Bishop of Coutances, and Ealdred, the Archbishop of York. The account of Orderic Vitalis, the Anglo-French chronicler of Norman England, tells how the assembled nobles cheered loudly when asked if they agreed to William becoming King of England.
The troops outside mistook these cheers for a fight between the Normans and English inside the church, so set fire to some of the English houses nearby before charging into the Abbey itself. The arrival of the troops panicked the coronation guests, many of whom fled the Abbey while the bishops frantically finished the ceremony amongst the commotion.