Who started the system of AD and BC? And if Christ was born in 4 BC how were 1,2 and 3 BC still before Christ? How did the use of AD and BC become so widespread?1 | AskHistorians Archive Observer

Who started the system of AD and BC? And if Christ was born in 4 BC how were 1,2 and 3 BC still before Christ? How did the use of AD and BC become so widespread?1

by Different-Discount60

jelvinjs7

The FAQ has a section about Calendars and how they evolved. Particularly, you’ll enjoy:

When was the Anno Domini (A.D.) system of years created? When did people start using it? by /u/sunagainstgold.
They say Jesus might have been born around 6-4 BC, but can that be BC? It should be 0AD, right? by /u/J-Force.