In the old roman calendar, december was the month. third. first. fourth. eighth. tenth. twelfth.

tenth.

Explanation:

The old roman calendar, or Romulus calendar consisted on ten months that lasted 30 or 31 days, and left 51 days at the end of the year as unorganized winter, this tradition of the months of 30 and 31 days helped the general roman organization with the main things that the republic had.

the revolution instituted a short-lived roman republic.