When Did The Julian Calendar Begin

When Did The Julian Calendar Begin. In 45 bc, julius caesar introduced the julian calendar, a significant reform that brought the roman calendar closer to the modern solar calendar. What is the julian calendar?

The julian calendar when julius caesar became pontifex maximus, the roman calendar had been so much abused that january was falling in autumn. The julian calendar was proposed in 46 bc by (and takes its name from) julius caesar, as a reform of the earlier roman calendar, which was largely a lunisolar one.