Sobhuza II , ( also known as Nkhotfotjeni , Mona ) ( 22 July 1899 -- 21 August 1982 ) was the Paramount Chief and later King of Swaziland for 82 years , the longest verifiable reign of any monarch in recorded history .
Sobhuza II , KBE ( also known as Nkhotfotjeni , Mona ) ( 22 July 1899 -- 21 August 1982 ) was the Paramount Chief and later King of Swaziland for 82 years . He was the longest-reigning monarch in recorded history .