Fidel Castro 1959-2010 - 51 years
As of my last update, Bruno Sammartino holds the record for the longest single reign as a world champion in WWE history, with a reign lasting 2,803 days as the WWE Champion.
The longest presidential reign in Kenya was 24 years by Daniel Arap Moi.
As the longest reign in European history.
Bruno Sammartino has held the WWE Championship the longest, a whooping 2803 days (first reign) from May 17th, 1963 to January 18th, 1971!John Cena has the longest reign for the current WWE Roster with 380 days for his third WWE Championship reign between September 17,2006 and October 2,2007.
Current Middleweight Champion Anderson Silva has the longest title reign in UFC history
From April 3 2005 to January 10 2006 (282 Days)
Kane
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King Ramses II and King Ramses III
The longest reigning monarch in world history is that of ancient egyptian Pharaoh Pepi II Neferkare. His reign lasted 94 years; from c. 2278 BC - c. 2184 BC. He succeeded to the throne at age six, after the death of Merenre I, and is generally credited with having the longest reign of any monarch in history.
the longest championship reign in wwe history was for 1,083 days
The longest reign in history was Pepi II of ancient Egypt, who ruled from childhood until his death, 94+ years, over 4,000 years ago.