Swaziland became a self-governing state in 1967 when Sobhuza II was recognised international as a king and the country acquired its own flag. On 6 September 1968 independent status was attained.

Sobhuza II of Swaziland holds the longest record of rule in recorded history. He assumed the throne on December 10, 1899 and died on August 21, 1982. His reign lasted 82 years, 254 days.

Sobhuza I was born in 1780.

Sobhuza I died in 1839.

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.