What civilization used a 365 day calendar and built their cities at thebes and memphis

Ancient Egypt

Explanation:

The Ancient Egyptians had their empire roughly on the territory of what is the modern day nation of Egypt, and small parts of Sudan at certain times. This civilization is well known for worshiping the god Ra, the Sun god. This was actually crucial when it came to the creation of their calendar, as they were worshiping the Sun, its cycles, and they were very well aware of all of them. Since the Earth needs approximately 365 days to circle around the Sun, that is also the amount of time needed for the Sun to be in the same position as the position in which it was on the sky taken as a starting point, thus the Egyptians made their calendar 365 days.

fairly positive it is 4