Picking back up with Pharaoh Dynasty
We find that Egypt was the making of Mizraim, son of Ham. The name 'Mizraim' is the original name given for Egypt in the Hebrew Old Testament. Hebrews associated Mizraim with the land of Egypt also known as “the land of Hamites” as referred to in Psalm 105:23. In the Old Testament, the twofold form of matzor could signify the two Egypts; Upper Egypt and Lower Egypt.
A Correct Chronology by David Down and Dr. John Ashton on January 21, 2010
Because of the ambiguous, and often erroneous nature of the information upon which Egyptian chronology must be calculated, it is not possible to present a full list of Egyptian dynasties and dates.
Assyrian chronology is far more reliable than Egyptian chronology and should be used as the basis for chronological calculations, and as biblical chronology is very specific and is consistent with Assyrian chronology, the Bible also can be used as a reliable source.
The difficulty and uncertainty in assigning dates can be illustrated by the following list for Dynasty 12. The exact lengths of reign are problematical. The figures listed below are as given in the monuments, Manetho, and those assigned by Breasted and Petrie. The conflicting figures may convey to the inexperienced reader the problems facing scholars trying to arrive at correct figures for Egyptian chronology.
The great pyramid of Khufu is usually assigned a date about 2550 B.C., but a more realistic date should be about 1875 B.C. when Abraham visited Egypt. Josephus says that Abraham brought with him from Ur knowledge of astronomy and arithmetic which he taught the Egyptians.