The earliest #Roman calendar is traditionally said to have been invented by King #Romulus himself. Like many ancient #calendars, it attempted to reconcile the movements of the #sun and the #moon. However, while the #Mesopotamians, #Indians, #Chinese, and #Muisca had long since worked out systems of adding extra months while the #Egyptians, #Iranians, #Mesoamericans, and #Quechua decided to disregard and moon and just use the sun, the early Romans did a little work and then threwe up their hands.