Bosporan era

The Bosporan era, also called the Bithynian era, Pontic era or Bithyno-Pontic era, was a calendar era used from 149 BC at the latest until at least AD 497 in Asia Minor and the Black Sea region. It originated in the Bithynian Kingdom and was also used in the Pontic Kingdom and, for the longest time, in the Bosporan Kingdom. The calendar era begins with the assumption of the royal title by Zipoetes I of Bithynia in October 297 BC, which marks the start of its year one. The Bosporan year began at the autumnal equinox.

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