The First Intermediate Period lasted 250 years which is amazing to consider since it was a dark age that we know very little about. No list of pharaohs exist for this period. Manetho describes the 7th Dynasty as '70 kings who ruled in 70 days'. This was a poetic form of symbolizing a demise of the central government.
Excavations at Memphis are difficult because of the high water table and extensive cultivation, and thus its a 'lost city'. Because the capital is gone, the First Intermediate Period is hard to study.
From what we do have of the sources we can surmise the following:
• The 8th Dynasty comprised of 17 or so kings, possibly descended from Pepi II that claimed to govern from Memphis. Their authority was mostly limited to around the ci