The document discusses the origins of Christmas being celebrated on December 25th. It notes that the earliest reference to this date is in a 4th century Roman calendar from 336 AD. The celebration of Christmas then spread from Rome to other areas, being observed in Africa by 360 AD and introduced to Constantinople in 380 AD. The feast of Christmas was first celebrated in Antioch, Syria on December 25th in 386 AD, having been adopted from Roman tradition rather than connected to the Epiphany on January 6th.