Panodorus of Alexandria was an Egyptian Byzantine monk, historian and writer who lived around 400.
More important than this is the Byzantine World Era, which long served as the standard of computation in the Eastern Empire, in Russia, among the Albanians, Servians, and Modern Greeks.
[1] By the 10th century, this dating system (its beginning fixed at 5509 BCE) became standard in the Byzantine Empire and thereby, the Orthodox countries of Eastern Europe.
But as such Anno Mundi time systems became very popular, they created a huge problem: end-of-world fever, caused by a threatening Seventh Day that equated to the end of the 6000-year period and corresponded to a date 500 years after Christ's birth year.
In 1492, Sir Thomas Browne supported also the belief that the world was created in 5509 BCE and that its ordained lifetime was 7,000 years.