Ruby jubilee
A ruby jubilee marks a 40th anniversary.
Ruby jubilees in recent history
    
| Monarch | Date of Jubilee | 
|---|---|
| King Frederick William III of Prussia | 1837 | 
| Emperor Pedro II of Brazil | 1881 | 
| Franz Joseph I Emperor of Austria & King of Hungary | 1888 | 
| King Norodom of Cambodia | 1901 | 
| King Carol I of Romania | 10 May 1906 | 
| King Chulalongkorn (Rama V) of Siam | 1908 | 
| King Alfonso XIII of Spain | 1926[1] | 
| King Gustaf V of Sweden | 1947 | 
| 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 | 
| Sultan Hassanal Bolkiah of Brunei | 5 October 2007 | 
| Brotherly Leader and Guide of the Revolution Muammar Gaddafi of Libya | 1 September 2009 | 
| Queen Margrethe II of Denmark | 14 January 2012[4][5] | 
| Sultan Qaboos bin Said of Oman | 23 July 2010 | 
| King Carl XVI Gustaf of Sweden | 15 September 2013[6] | 
See also
    
    
References
    
- "Spain Medal Homage Royal Family Crown 1925 Spanish Decoration - Dracomedals Medals-Orders Medals Orders Decorations". www.medals-orders.com. Archived from the original on 2016-10-30.
- พระเจ้าอยู่หัวในพระบรมโกศ กษัตริย์พระองค์เดียวในโลกที่ได้รับการเฉลิมฉลอง [Platinum Jubilee].
- "Queen marks Ruby Jubilee". Times Daily. Vol. 124, no. 154. June 3, 1993. p. 1.
- Queen Margrethe celebrates 40 years on Danish throne
- "Queen Margrethe II of Denmark marks 40 years on the throne". BBC News. Denmark. 12 January 2012.
- "The King: 40 years as Sweden's Head of State - Sveriges Kungahus".
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