That before the construction of the pyramid of Cheops or the appearance of Pharaoh Akhenaten?

Scientists believe that the pyramid of Cheops was built by his nephew and vizier Hemiun. The completion of construction is attributed to the 2540th year BC. Perhaps the construction took about 20 years. No one at the moment can accurately indicate the date of the start of construction. Scientists believe that construction began even in 2850 BC. As for the famous reformer pharaoh Akhenaten, scientists believe that he was born in 1375 BC. From these dates it is clearly seen that the pyramid was built in the 3rd millennium BC, and Akhenaten ruled in the 2nd. There were pyramids before.