"Longest Ruling Ancient Egyptian Dynasty Revealed"
The 18th dynasty of Ancient Egypt, which lasted around 250 years, is the longest dynasty. It started around 1550 B.C. and ended with the death of Tutankhamun. Historians divide Egypt's history into 30 dynasties, but the concept of dynasties was created by Manetho in the third century B.C. The periods of Greek and Roman rule were longer than any of the Egyptian dynasties.