Mercedonius

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What Wikipedia says

Mercedonius (Latin for "Work Month"), also known as Mercedinus, Interkalaris or Intercalaris (Latin: mensis intercalaris), was the intercalary month of the Roman calendar. The resulting leap year was either 377 or 378 days long.

Excerpt from the Wikipedia article “Mercedonius”, under the CC BY-SA 4.0 license. Read the article on Wikipedia