Equatorial Guinea's President Teodoro Obiang Nguema Mbasogo addresses the 67th United Nations General Assembly at the U.N. Headquarters in New York, September 27, 2012. REUTERS/Lucas Jackson
Al Jazeera: The world's 7 longest-serving rulers
As of today, the world's longest serving president is Teodoro Obiang.
Vladimir Putin is expected to win Russia's presidential election on Sunday, giving him a fourth term that would take him to nearly a quarter-century as a head of state or government.
Other leaders who have been in power for more than a quarter of a century include Tajikistan's Emomali Rakhmon, Cameroon's Paul Biy and Equatorial Guinea's Teodoro Obiang Nguema.
Here is the list of the world rulers who have held power the longest - excluding monarchs enthroned for life.
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WNU Editor: There are a lot of dinosaurs in this group.
