First Intermediate Period of Egypt

The First Intermediate Period, described as a 'dark period' in ancient Egyptian history, spanned approximately 125 years, c. 2181 – c. 2055 BC, after the end of the Old Kingdom. It comprises the Seventh (although this is mostly considered spurious by Egyptologists), Eighth, Ninth, Tenth, and part of the Eleventh Dynasties.

Source: Wikipedia — First Intermediate Period of Egypt (CC BY-SA 4.0)