9. Carl XVI Gustaf of Sweden – 42 Years, 128 Days
He is the currently reigning Swedish King. He assumed the reigns of the kingdom at the young age of 27 years old following the demise of Gustaf VI Adolf, his grandfather, on the 15th of September, 1973. His father, who would have been next in line to the throne, perished in a plane crush when he was just a year old. He adopted the title “King of Sweden”, breaking the centuries-old tradition held by his predecessors of being given the much longer title of “By the Grace of God King of the Swedes, the Goths/Geats and the Wends.” He is among the longest reigning current monarchs having been king for 42 years. He has been considered among the most modernized royals of the 20th century, especially after he picked the slogan “For Sweden with the times.”
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