Talk:Timeline for the Masks of Dii Consentes
B.C. timelines are always a countdown to year 1 B.C., so Phidias could not have done something in 339 in preparation for 340 - the previous year. After 1 B.C. medieval calendars and our own began with year 1 A.D. and ascend thereafter. This calendar era is based on the traditionally reckoned year of the conception or birth of Jesus of Nazareth, with AD counting years from the start of this epoch, and BC denoting years before the start of the era. There is no year zero in this scheme, so the year AD 1 immediately follows the year 1 BC. This dating system was devised in 525 by Dionysius Exiguus of Scythia Minor, but was not widely used until after 800. -- "The Magister 14:53, 19 July 2020 (MDT)"
