Sargon of Akkad was a ruler in ancient Mesopotamia who conquered the Sumerian city-states in the 23rd and 22nd centuries BC, reigning for 56 years according to historical records. His rule was continued after his death by natural causes in old age by his grandson who succeeded his power.

1. #5: Sargon
• Sargon of Akkad, also known as Sargon the Great "the
Great King", was a Semitic Akkadian emperor famous
for his conquest of the Sumerian city-states in the 23rd
and 22nd centuries BC.
• According to the Sumerian king list, Sargon reigned for
56 years and died in old age of natural causes.
• His grandson continued his power after his death.
Links: http://www.ancient.eu/Sargon_of_Akkad/