Question: who is the world's longest reigning monarch ever
Answer: Rank Name State Reign Duration From To ( days ) ( years , days ) Sobhuza II Swaziland 10 December 1899 21 August 1982 30,204 7004302040000000000 ♠ 82 years , 254 days Bernhard VII Lippe ( HRE ) 12 August 1429 2 April 1511 29,818 7004298180000000000 ♠ 81 years , 234 days William IV Henneberg - Schleusingen ( HRE ) 26 May 1480 24 January 1559 28,731 7004287310000000000 ♠ 78 years , 243 days Karansinhji Lakhtar State ( India ) 15 June 1846 8 August 1924 28,543 7004285430000000000 ♠ 78 years , 54 days 5 Heinrich XI Reuss - Obergreiz ( HRE ) 17 March 1723 28 June 1800 28,227 70042822700