October (Roman month) did not number days of a month sequentially from the 1st through the last day. Instead, they counted back from the three fixed points of the month: the Nones (5th or 7th), the Ides (13th or 15th), and the Kalends (1st) of the following month. The Nones of October was the 7th, and the Ides was the 15th. The last day of October was the "pridie Kalendas Novembris," "day before the Kalends of November". Roman counting was inclusive; October 9 was "ante diem VII Idūs Octobris", "the 7th day before the Ides of October," usually abbreviated "a.d. VII Id. Oct."
Roman Month Roman Month The Roman Month (German "Römer Monat", pl. "Römer Monate", abbr. RM) was a basic unit of imperial taxation in the Holy Roman Empire, initially worth around 128,000 Rhenish guilders when the underlying tax was created in 1521 by the emperor Charles V, equivalent to a month's wages for around 4,202 cavalry and 20,063 infantrymen. It gained this title due to its initial purpose of providing for one month's escort for the emperor's trip to Rome to be crowned by the Pope, though it was rarely, if ever, used for this purpose. The tax was collected through a system