First Intermediate Period, which lasted from roughly 2150 to 2030 B.C.
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150 years of chaos. Much was lost, even more forgotten, many died.
“It is believed that during that time, temples were pillaged and violated, artwork was vandalized, and the statues of kings were broken or destroyed as a result of the postulated political chaos”
https://en.wikipedia.org/wiki/First_Intermediate_Period_of_Egypt