The aliens helped the Egyptians build it.
The Pyramids of Giza (including the Great Pyramid) were built during the Old Kingdom. Most pyramids were built during the Old and Middle Kingdoms.
The old and middle kingdoms
old kingdom
Pyramids were built in Egypt from about 2900 B.C.E until 1400 B.C.E.
Many pyramids were built during the old kingdom
Old Kingdom.
The Pyramids were built between 2700 B.C. to 1500 B.C. during the Old Kingdom
Pyramids were built from the 3rd dynasty (c.2650BC) during the Old Kingdom until about 1550BC the end of the Middle Kingdom.
During the Old and Middle Kingdoms (approx. 2650-1550BC)
The Old Kingdom.
Most pyramids in Egypt were built during the Old Kingdom and Middle Kingdom periods. These periods lasted from 2686 BC to 1650 BC.
the pyramids were built predominantly in the old and middle kingdom periods, with the last of the pyramids being built by king Ahmose (the first ruler of the new kingdom period).