On this day: December 25
POSTED: 12:30 AM Dec 23 2012
UPDATED: 1:00 AM Dec 25 2012
George Washington crosses the Delaware, "To Kill a Mockingbird" premieres, Gorbachev resigns, and passengers on a Christmas flight into Detroit foil the "Underwear Bomber," all on this day.
Public domain
A.D. 336: The first recorded celebration of Christmas on December 25 takes place in Rome, according to an entry in the Chronograph of A.D. 354, or the Philocalian Calendar. The document reflects the dies natalis Christi, "the birthday of Christ," as the "eighth before the calends of January," or December 25.

