March 25 - Gabriel Announces Christ to Mary?

From Today in Christian History by Studylight.org:

1 - Roman Church historian Dionysius Exiguus (ca.500-550), in calculating his history of the Christian Church, took this day as the supposed date of the Annunciation ["The angel Gabriel's announcement to the Virgin Mary of the Incarnation." "annunciation." The American Heritage® Dictionary of the English Language, Fourth Edition. Houghton Mifflin Company, 2004. Answers.com 25 Mar. 2006; see also Luke 1:26-35]. March 25th afterward became the first day of the calendar year, until the Gregorian Calendar Reform of 1582 changed the day to January 1st.

Angels Annunciation Dionysius Exiguus Gabriel Gregorian Calendar History
January 1 March 25 New Years Day Christian Christianity