So I just stumbled across this theory that the Holy Roman Emperor Otto III, Pope Sylvester II, and possibly the Byzantine Emperor Constantine VII, fabricated the Anno Domini dating system retrospectively, in order to place them at the special year of AD 1000, and to rewrite history to legitimize Otto's claim to the Holy Roman Empire.
Here is an interesting Video about it:
https://www.youtube.com/watch?v=vyYuGbRcl3A&t
What is your opinion about this?