Egypt in the Middle Kingdom (ca. 2030–1650 B.C.) – The Metropolitan Museum of Art https://www.metmuseum.org/essays/egypt-in-the-middle-kingdom-2030-1640-b-c
The Middle Kingdom (mid-Dynasty 11–Dynasty 13, ca. 2030–1640 B.C.) began when Nebhepetre Mentuhotep II reunited Upper and Lower Egypt, setting the stage for a second great flowering of Egyptian culture.
Many Middle Kingdom pyramids were constructed with mud-brick cores that eroded after
