The 304-day Romulus Calendar I didn't work as the years progressed since the calendar did not align with the seasons of the year.
The second King of Rome, Numa Pompilius (reigned 715-673 B.C.), reformed the calendar around the year 54 UAC, or 700 B.C.E., by shortening the months with 30 days (they'll be back to 30, or 31 for Sextilis and December, later), Aprillis, Iunius, Sextilis, September, November and December, to 29 days. He added the 29 day month of Ianuarius before Martius and made Ianuarius the start of the calendar, and added the 28 day month of Februarius after December and made Februarius the end of the calendar.
A day was taken from each month of 30 days, leaving the months with 31 days alone. The length of the calendar expanded from 304 to 355 days, with 11 or 12 days leftover.
Since the calendar was too short, and the Romans would rather have a full-year calendar instead of one that took a 61 to 62 day break, an intercalary month was instituted by Pompilius to be placed between Februarius and Ianuarius. The intercalary month would be called Mercedonius, or Intercalaris, with the meaning in Latin: mensis intercalaris, having 22 or 23 days depending on year, but with a catch.
Mercedonius was supposed to be inserted every two years or so to align the conventional 355-day Roman year with the solar year.
The catch? Mercedonius would have its 22 or 23 days placed after what is now known as February 23 (VII Kal.). The 22 days (or in some cases, 23 days) of Mercedonius would commence after February 23. After that, the five days of February that were displaced when Mercedonius was inserted would follow as part of Mercedonius to make it a 27 or 28 day month.
Since the Republican Calendars used the Kalends way of counting down to the following month, the days in Februarius would be called VI Kal. Ian (for Feb 24), V Kal. Ian (for Feb 25), IV Kal. Ian (for Feb 26), III Kal. Ian (for Feb 27) and pridie Kal Ian (for Feb 28).
When the last five days of Februarius became the last five days of Mercedonius, the days in that month would be called VI Kal. Ian (for Mer 23 or 24), V Kal. Ian (for Mer 24 or 25), IV Kal. Ian (for Mer 25 or 26), III Kal. Ian (for Mer 26 or 27) and pridie Kal Ian (for Mer 27 or 28).
I'm not sure if the truncated month of February still had the equivalent of Feb 23 as VII Kal Mer. or if it was changed to pridie Kal. Mer, but I'm guessing it wasn't called VII Kal. Ian since Ianuarius wasn't next on the intercalary calendar. I need to do more research on this.
The intercalary month was used to align the calendar with the solar year to create an average year of about 365 days over the course of time, with the years with the intercalary month expanded to either 377 or 378 days to counter the 355 day non-intercalary years.
The extra months were added arbitrarily at unpredictable intervals as determined by the pontifex maximus, the high priest of the College of Pontiffs in ancient Rome.
Some sources say February was cut short to 23 or 24 days with a 27 day Mercedonius taking over afterwards.
Mercedonius was supposed to occur every two years, but the Roman pontiffs in charge of it in later decades abused the timing for their own political purposes, resulting in the calendar going out of whack into the middle of the 1st century B.C.E.
Around the year 453 B.C., some adjustments to the order were made as we will see in the Republican Calendar II.
Numeric Day of Month | Mart. Mai. Quin. Oct. (31 days) | no months (30 days) | Apr. Iun. Sext. Sept. Nov. Dec. Ian. (29 days) | Feb (28 or 23 days) Mer. (28 days) | Mer. (27 days) |
---|---|---|---|---|---|
1 | Kal. | Kal. | Kal. | Kal. | Kal. |
2 | VI Non. | IV Non. | IV Non. | IV Non. | IV Non. |
3 | V Non. | III Non. | III Non. | III Non. | III Non. |
4 | IV Non. | Prid. Non. | Prid. Non. | Prid. Non. | Prid. Non. |
5 | III Non. | Non. | Non. | Non. | Non. |
6 | Prid. Non. | VIII Id. | VIII Id. | VIII Id. | VIII Id. |
7 | Non. | VII Id. | VII Id. | VII Id. | VII Id. |
8 | VIII Id. | VI Id. | VI Id. | VI Id. | VI Id. |
9 | VII Id. | V Id. | V Id. | V Id. | V Id. |
10 | VI Id. | IV Id. | IV Id. | IV Id. | IV Id. |
11 | V Id. | III Id. | III Id. | III Id. | III Id. |
12 | IV Id. | Prid. Id. | Prid. Id. | Prid. Id. | Prid. Id. |
13 | III Id. | Id. | Id. | Id. | Id. |
14 | Prid. Id. | XVIII Kal. | XVII Kal. | XVI Kal. | XV Kal. |
15 | Id. | XVII Kal. | XVI Kal. | XV Kal. | XIV Kal. |
16 | XVII Kal. | XVI Kal. | XV Kal. | XIV Kal. | XIII. Kal. |
17 | XVI Kal. | XV Kal. | XIV Kal. | XIII. Kal. | XII Kal. |
18 | XV Kal. | XIV Kal. | XIII. Kal. | XII Kal. | XI Kal. |
19 | XIV Kal. | XIII Kal. | XII Kal. | XI Kal. | X Kal. |
20 | XIII Kal. | XII Kal. | XI Kal. | X Kal. | IX Kal. |
21 | XII Kal. | XI Kal. | X Kal. | IX Kal. | VIII Kal. |
22 | XI Kal. | X Kal. | IX Kal. | VIII Kal. | VII Kal. |
23 | X Kal. | IX Kal. | VIII Kal. | VII Kal. | VI Kal. |
24 | IX Kal. | VIII Kal. | VII Kal. | VI Kal. | V Kal. |
25 | VIII Kal. | VII Kal. | VI Kal. | V Kal. | IV Kal. |
26 | VII Kal. | VI Kal. | V Kal. | IV Kal. | III Kal. |
27 | VI Kal. | V Kal. | IV Kal. | III Kal. | Prid. Kal. |
28 | V Kal. | IV Kal. | III Kal. | Prid. Kal. | -- |
29 | IV Kal. | III Kal. | Prid. Kal. | -- | -- |
30 | III Kal. | Prid. Kal. | -- | -- | -- |
31 | Prid. Kal. | -- | -- | -- | -- |
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