originally there were only ten months in the roman calendar. and the beginning of the year was in March.
December was the tenth month.
according to Wikipedia, the days between December and March were actually not part of any month. so the year ended in December.
At some point, they started adding an extra intercalary eleventh month for tax purposes in this period (I think this later became February). At some point, this month became a permanent feature of the calendar.
sometime later they added "August" as well.
voila. twelve months.
Wait I’m wrong, they added January and not August. August was simply renamed, it used to be called something else.
Also @OzyWho , apparently the Julian Calendar was the first that had a 365-days long year.
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So in 45BC
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I knew that and it was a trick question
@Magoroth - tricked you!