What was great about the middle kingdom in acient egypt?

The Eleventh Dynasty of Ancient Egypt was a group of pharaohs whose earlier members are grouped with the four preceding dynasties to form the First Intermediate Period, while the later members from Mentuhotep II onwards are considered part of theMiddle Kingdom. They all ruled from Thebes.

that is a sample from https://www.cemml.colostate.edu/cultural/09476/egypt02-04enl.html