Serious answer about what the year would have been in 1 AD, according to 63-year-old Emporer Augustus: DCCLIV754 Ab Urbe Condita
That means "from the founding of the city" - they based their calendar on the mythical founding of Rome, as calculated by Verro, who himself was not long dead at that point. Before that, they just counted the years of each person's reign Japanese-style. Probably other people in the ancient world had older calendars.
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Serious answer about what the year would have been in 1 AD, according to 63-year-old Emporer Augustus:
DCCLIV754 Ab Urbe ConditaThat means "from the founding of the city" - they based their calendar on the mythical founding of Rome, as calculated by Verro, who himself was not long dead at that point. Before that, they just counted the years of each person's reign Japanese-style. Probably other people in the ancient world had older calendars.