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Roman calendar

Discover how ancient Romans told time with a calendar that changed over hundreds of years!

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University of Pennsylvania LJS 267: De ludo scacchorum seu de moribus hominum et officiis nobilium ... etc., fol. 40v

University of Pennsylvania LJS 267: De ludo scacchorum seu de moribus hominum et officiis nobilium ... etc., fol. 40v

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Key Facts

Original Number of Months
10 months.
First Roman King
Romulus.
Calendar Reformer
Julius Caesar.
Leap Year Rule
Added a leap day every four years (in the Julian calendar).
Fun Fact
The Roman calendar had special days called Kalends, Nones, and Ides, which were linked to the moon.

What's a Roman Calendar?

Imagine a super old clock that the Romans used to count days, months, and years. It wasn't like our calendar today! The very first Roman calendar had only 10 months and started in the spring with March.

Winter was just a time with no assigned days. It helped them know when to have festivals and do important jobs. Some days were special, like the Kalends, Nones, and Ides, which were like markers for the moon's phases.

Who Made the First Calendar?

Legend says a king named Romulus created the first Roman calendar. He was the first king of Rome! His calendar had 10 months, and each month had 30 or 31 days.

After Romulus, another king, Numa Pompilius, made changes. He added January and February to the winter months and tried to make the calendar match the sun and moon better. This made the year longer and helped keep festivals in the right seasons.

Why Did It Change So Much?

The Romans had trouble keeping their calendar accurate! Sometimes, they didn't add the extra days needed to keep it in sync with the sun and seasons. This meant their calendar could be way off, like being in the wrong season!

Julius Caesar, a famous Roman leader, made a big change around 46 BC. He created a new calendar, the Julian calendar, which was more like the one we use today, with 12 months and a leap day every four years.

A Calendar for Everyone

The Roman calendar was super important for daily life. It helped people know when to plant crops, when to celebrate holidays, and when important meetings would happen. Even though it changed a lot, from a simple 10-month system to a more complex one, it laid the groundwork for the calendars we use now. The Julian calendar was a huge step, and it lasted for a very, very long time!

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