Adding two more months (Januarius and Februarius) wasn't the problem and they probably always have existed, but starting the year with January instead of March was. This decision was made in 601 AUC (153 BCE) much later than the legendary king.

Thank you for the history lesson. I was only peripherally aware of the story.

So from your post I take it he's no longer available for stabbing?

Hmm thanks for the lesson, I never really paid much attention to calendar reform in ancient Rome. Interesting to see how much random fake history is memed around.

Prior to that the winter just wasn't counted as an official period where things could happen, I guess.

Although everything recorded from the monarchy era should be taken with a grain of salt.

Mars was also the god of agriculture, which was the main reason the first month was named after him, as that was when the sowing of fields started as well as war campaigns usually starting around that time of year as well.

I forget, but was Intercalaris not a month in the Roman calendar too? If I remember correctly, they had a leap month that they would implement some years to realign the calendar, but I forget if that was Intercalaris or the one that starts with an M. I always forget what it's called.