^The country was formerly named the Kingdom of Swaziland until 19 April 2018.
^ abLetsie III first reigned during 12 November 1990 – 25 January 1995, was deposed, then returned to the throne on 7 February 1996. Length of reign calculation includes both tenures.
^Ibrahim Iskandar is also the currently-reigning Yang di-Pertuan Agong, and has reigned for 181 days (since 31 January 2024).