Earlier Christians believed that the Annunciation, or the day Mary was informed she would give birth to a special child named Jesus, occurred on March 25. The Roman Christian historian Sextus Julius Africanus claims that 'Jesus' conception took place on this day, which is December 25th after 9 months. It is therefore celebrated as Christmas Day.
Early Christians, however, maintained a variety of beliefs, including the notion that the world was created on March 25, and some even insisted that 'Jesus' adult death took place on that day.
Saturnalia, a celebrated Roma event, and the Winter Solstice were both celebrated on December 25.
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