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Why did the Romans add two months?

Author

Emma Payne

Published Jan 06, 2026

Around 713 B.C., Numa Pompilius, the second king of Rome, reformed the calendar significantly. The calendar was becoming important to more than agriculture, so it was necessary to assign the roughly 60 monthless days to two new months.

Why did they add January and February?

According to tradition, the Roman ruler Numa Pompilius added January and February to the calendar. This made the Roman year 355 days long. To make the calendar correspond approximately to the solar year, Numa also ordered the addition every other year of a month called Mercedinus.

Why were July and August added to the calendar?

The months of January and February were added to the calendar and the original fifth and sixth months were renamed July and August in honour of Julius Caesar and his successor Augustus. These months were both given 31 days to reflect their importance, having been named after Roman leaders.

Why did the Romans only have 10 months?

The 304-day Roman calendar didn't work for long because it didn't align with the seasons. King Numa Pompilius reformed the calendar around 700 BCE by adding the months of January (Ianuarius) and February (Februarius) to the original 10 months, which increased the year's length to 354 or 355 days.

Where did the extra 2 months come from?

In 46 BC, Julius Caesar brought the calendars back into line by adding two extra months of a total of 67 extra days to the year. He then brought in the best philosophers of the time to correct the calendar permanently.

30 related questions found

Why is October called October?

October, 10th month of the Gregorian calendar. Its name is derived from octo, Latin for “eight,” an indication of its position in the early Roman calendar.

Why is September not the 7th month?

September is the ninth month because two months were added to the original ten month calendar, but those months were January and February. Contrary to popular belief the months of July and August were NOT added, they simply were renamed.

Why is January 1st the first day of the year?

As part of his reform, Caesar instituted January 1 as the first day of the year, partly to honor the month's namesake: Janus, the Roman god of beginnings, whose two faces allowed him to look back into the past and forward into the future.

Why is January named after Janus?

January is named after the Roman god Janus. As you can see in this print, he had two faces so he could see the future and the past! He was also the god of doors.

Why is February so short?

Because Romans believed even numbers to be unlucky, each month had an odd number of days, which alternated between 29 and 31. But, in order to reach 355 days, one month had to be an even number. February was chosen to be the unlucky month with 28 days.

When did year 1 start?

A monk called Dionysius Exiguus (early sixth century A.D.) invented the dating system most widely used in the Western world. For Dionysius, the birth of Christ represented Year One. He believed that this occurred 753 years after the foundation of Rome.

What was April named after?

APRIL: The name for this month may come from a Roman word for “second” – aprilis – as it was the second month of the Roman year. MAY: Spring is in full bloom for the Romans in May, and this month is named after Maia – a goddess of growing plants. JUNE: This month is named after Juno, the queen of the Roman gods.

Why is September named September?

September comes from the Latin word septem, meaning “seven,” because it was the seventh month of the early Roman calendar.

Did Romans have weekends?

The Romans did not recognize the week as a unit of time, so didn't have weekends. The week came out of Middle Eastern civilization and became a part of Jewish culture, and thus was used by the Christian Church. When Christianity spread throughout the Roman Empire, the week began to be adopted into Western culture.

Why are months named what they are?

The modern Gregorian calendar has roots in the Roman calendar, specifically the calendar decreed by Julius Caesar. So, the names of the months in English all have Latin roots. Note: The earliest Latin calendar was a 10-month one, beginning with March; thus, September was the seventh month, October, the eighth, etc.

Why did Caesar change the calendar?

He watched her scientists in Alexandria use calendars to predict the flooding of the Nile, and eclipses too. Caesar decided it was time to reform the Roman calendar. To get things started, he added two additional months to the calendar, lining up the equinox.

What was July named after?

July, seventh month of the Gregorian calendar. It was named after Julius Caesar in 44 bce. Its original name was Quintilis, Latin for the “fifth month,” indicating its position in the early Roman calendar.

Why is December not the 10th month?

Why Is December Not the Tenth Month? The meaning of December stems from the Latin word decem, meaning ten. The old Roman calendar started in March, making December the tenth month. When the Roman senate changed the calendar in 153 BCE, the new year started in January, and December became the twelfth month.

What God is November named after?

In the Imperial period, the deity who often represents November in Roman art is Isis. The festival of Isis, which began October 28, continued through November 3.

Why is January colder than December?

January is colder than December since the warmth of the ground in the holiday months were already released. This means, when January comes, the heat is already reduced from the ground and the Sun's heat only increases slightly, compared to other months.

Did Julius Caesar change the calendar?

In 45 B.C., Julius Caesar ordered a calendar consisting of twelve months based on a solar year. This calendar employed a cycle of three years of 365 days, followed by a year of 366 days (leap year). When first implemented, the "Julian Calendar" also moved the beginning of the year from March 1 to January 1.

What is the oldest calendar still in use?

The oldest calendar still in use is the Jewish calendar, which has been in popular use since the 9th century BC. It is based on biblical calculations that place the creation at 3761 BC.

Why do the last four months end in Ber?

The -ber in four Latin month names is probably from -bris, an adjectival suffix. Tucker thinks that the first five months were named for their positions in the agricultural cycle, and "after the gathering in of the crops, the months were merely numbered."

Why was October the 8th month?

The meaning of October comes from the Latin word Octo meaning eight. The old Roman calendar started in March, so October was the eighth month. When the Roman senate changed the calendar in 153 BCE, the new year started in January, and October became the tenth month.

What God is September named after?

In calendar mosaics from Hellín in Roman Spain and Trier in Gallia Belgica, September is represented by the god Vulcan, the tutelary deity of the month in the menologia rustica, depicted as an old man holding tongs.