Nothing prepared Egypt for the eclipse of royal power and poverty that came after Pepy II (Neferkare). The fall of the Egyptian Old Kingdom. I think the first rip into the fabric of Egypt's empire was the ambition of Akhenaten.

The … It was given independence in 1922. The turbulence of the 18th Dynasty the heretic king Akhenaten had largely been stabilised and reversed by the 19th Dynasty.

Ancient Egypt’s Decline And Fall. The Oxford History of Ancient Egypt edited by I Shaw (Oxford, 2000) Egypt's Golden Empire by JA Tyldesley (London, 2001) Places to visit. While the highly successful Ramses II and his successor, Merenptah (1213-1203 BCE) had both defeated invasions by the Hyskos or Sea …

I don't believe Egypt fully recovered from his reign.

However, signs of decline were evident by the advent of the 20th Dynasty (c.1189 BC to 1077 BC). The Roman province of Egypt (Latin: ... and the war was brought to an end by the fall of Khosrow on 25 February 628. It's difficult to pinpoint exactly what caused the demise of Egypt. The Egyptians had no love of the emperor in Constantinople and put up little resistance. Egypt fell under British control in 1882 when it became a protectorate of the realm.