"In ancient Egyptian history, the Old Kingdom is the period spanning c. 2686–2181 BC. It is also known as the "Age of the Pyramids" or the ...
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"Age of the Pyramid Builders", as it encompasses the reigns of the great pyramid builders of the Fourth Dynasty— among them King Sneferu, who perfected the art of pyramid-building, and the kings Khufu, Khafre and Menkaure, who constructed the pyramids at Giza. Egypt attained its first sustained peak of civilization during the Old Kingdom—the first of three so-called "Kingdom" periods (followed by the Middle Kingdom and New Kingdom) which mark the high points of civilization in the lower Nile Valley." - (en.wikipedia.org 16.10.2019)
