The ancient Romans made many attempts to fix the calendar year before landing on 12 months and leap years

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Why Julius Caesar's Year of Confusion was the longest year in history

https://www.bbc.com/future/article/20240227-how-julius-caesar-made-the-longest-year-in-history-and-brought-us-leap-years

To tame a hopelessly disorganised Roman calendar, Julius Caesar added months, took them away, and invented the leap year.

Why Julius Caesar's Year of Confusion was the longest year in history

I edited the title because my grammar is terrible