History of Christmas: The Year — How Could Jesus be born 4 B.C.?

Bill Petro
3 min readNov 29, 2022
Dionysius Exiguus

It’s obvious that Jesus was born on December 25, A.D. 1 (Anno Domine, “the year of our Lord”), right? Not so fast.

OK, was it in Year Zero?

No, there wasn’t a Year 0; the calendar went from 1 B.C. to A.D. 1.

We know that Herod the Great (who killed all the babies in Bethlehem younger than two years of…

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Bill Petro

Writer, historian, technologist. Former Silicon Valley tech exec. Author of fascinating articles on history, tech, pop culture, & travel. https://billpetro.com