Pope Honorius II is consecrated, having been elected after the controversial dethroning of Pope Celestine II.

Pope Honorius II, born Lamberto Scannabecchi, was head of the Catholic Church and ruler of the Papal States from 21 December 1124 to his death in 1130.

December 21 is the 355th day of the year in the Gregorian calendar; 10 days remain until the end of the year.