The Romans invented it in 46 ad.
George Washington invented the lunar calendar
The name of the person that invented the first calendar is not known. The first calendar was invented in Scotland.
China
The Egyptian
Rome
The calendar was technically first invented by the Ancient Egyptians.
I t was invented around 4231 B.C.
Egypt
Around 500BC
173 a.c.
mesopotamia
In Calendaria, Babalonia.