King Bhumibol Adulyadej, also known as Rama IX, has reigned since the 9th of June 1946.
King John reigned from the 6th April 1199 until the 19th of October 1216.
King Solomon reigned over Isa real for 40 years.
King Louis XVI reigned from 1774 to 1793.
King Josiah of Isreal, became king at age 8, and reigned for 31 years (died at age 39).
Edward the Confessor reigned for 23 years.
Correct question is: What King is reigning the longest? The answer is God himself. If the question is which human king reigned the longest, it is currently Sobhuza II of Swaziland who reigned for 82.6 years. To read more about long-reigning monarchs, visit the Related Link below.
He reigned from 1333 to 1324 BCE, so about 9 years.
He reigned three years. I Kings 11&2 "Now in the eighteenth year of King Jeroboam, the son of Nebat, Abijam became king over Judah. He reigned three years in Jerusalem."
Since 5 May 1950
King Tawhiao reigned for 34 years, from 25 Jun 1860 until his death on 26 August 1894.
Leopold II reigned as Belgium's king from 1865 until his death in 1909.
King George III was king for about 60 years, if he is the 'King George' you are asking about.