A ruby jubilee marks a 40th anniversary.
Ruby jubilees in recent history
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| Monarch
|
Year of Ruby Jubilee
|
| King Frederick William III of Prussia
|
1837
|
| Günther Friedrich Karl II, Prince of Schwarzburg-Sondershausen
|
1875
|
| Emperor Pedro II of Brazil
|
1881
|
| Frederick Francis II, Grand Duke of Mecklenburg-Schwerin
|
1882
|
| Ernest II, Duke of Saxe-Coburg and Gotha
|
1884
|
| George Tupou I of Tonga
|
1885
|
| George Victor, Prince of Waldeck and Pyrmont
|
1885
|
| Franz Joseph I Emperor of Austria & King of Hungary
|
1888
|
| Peter II, Grand Duke of Oldenburg
|
1893
|
| Charles Alexander, Grand Duke of Saxe-Weimar-Eisenach
|
1893
|
| Ernst I, Duke of Saxe-Altenburg
|
1893
|
| Johann II of Liechtenstein
|
1898
|
| Frederick I, Grand Duke of Baden
|
1898
|
| Heinrich XXII, Prince Reuss of Greiz
|
1899
|
| Frederick William, Grand Duke of Mecklenburg-Strelitz
|
1900
|
| King Norodom of Cambodia
|
1901
|
| Emperor Gojong of Korea
|
21 Jan 1904
|
| King Carol I of Romania
|
10 May 1906
|
| George II, Duke of Saxe-Meiningen
|
1906
|
| King Chulalongkorn (Rama V) of Siam
|
1908
|
| Emperor Meiji of Japan
|
1908
|
| King Alfonso XIII of Spain
|
1926[1]
|
| Sobhuza II of Swaziland
|
1939
|
| King Gustaf V of Sweden
|
1947
|
| Sālote Tupou III of Tonga
|
1958
|
| Emperor Showa of Japan
|
Dec 1966
|
| Franz Joseph II of Liechtenstein
|
1978
|
| King Bhumibol Adulyadej (Rama IX) of Thailand
|
1986[2]
|
| Prince Rainier III of Monaco
|
1989
|
| Queen Elizabeth II of the United Kingdom and the other Commonwealth Realms
|
6 February 1992[3]
|
| King Hussein of Jordan
|
1992
|
| Tāufaʻāhau Tupou IV of Tonga
|
16 December 2005
|
| Sultan Hassanal Bolkiah of Brunei
|
5 October 2007
|
| Brotherly Leader and Guide of the Revolution Muammar Gaddafi of Libya
|
1 September 2009
|
| Sultan Qaboos bin Said of Oman
|
23 July 2010
|
| Queen Margrethe II of Denmark
|
14 January 2012[4][5]
|
| King Carl XVI Gustaf of Sweden
|
15 September 2013[6]
|
