5493 B.C.

However, Byzantine historians like Maximus the Confessor, Theophanes the Confessor and George Syncellus continued to begin their year on 25 March and to number their years from that date in 5493 BC until the tenth century. Ever since the Roman Empire conquered the region surrounding the eastern Mediterranian Sea, its Latin months had been transcribed into Greek. http://en.wikipedia.org/wiki/Byzantine_calendar