A decadal birthday - King Carl Gustaf together with his family greeting well-wishers on his 60th birthday on April 30, 2006. The special birthday was celebrated with several events and guests from various royal houses for three days.
May 2, 1993 – Queen Noor and King Hussein pictured during the 40th anniversary of his reign.
Queen Margrethe of Denemark celebrated her 40th anniversary as Queen of Denmark in January this year.
This picture was taken on 15 January 2012, when the Queen and the Prince Consort appeared at the balcony of Amalienborg Palace with their family and other Royal guests.
Source: Jens Dresling, Polfoto via kongehuset.dk
50th throne anniversary for Prince Rainier of Monaco - Prince Rainier on May 9, 1999 being congratulated by the people of Monaco and his family including Princess Antoinette, Princess Stephanie, Prince Ernst August, Princess Caroline, Andrea Casiraghi and Prince Albert.
Members of the Spanish Royal family are pose together for a group portrait before a gala hosted for King Juan Carlos' 70th birthday in 2008.
July 15, 2008 - Sultanah Haminah of Kedah waves to the crowd during a parade to celebrate the Golden Jubilee of her husband’s reign as the ruler of the Malaysian state. Also pictured, Sultan Abdul Halim Mu’adzam Shah.
Source: The Star Online
G. Great Britain
Beatrix, Queen of the Netherlands is greeted by Queen Elizabeth II as he arrives at a lunch for Sovereign Monarch's held in honour of Queen Elizabeth II's Diamond Jubilee, at Windsor Castle, on May 18, 2012 in Windsor, England.
Source: Zimbio/Getty Images
King Harald's 70th birthday celebration: The group portrait shows members of many different Royal families during the birthday gala in February 2007.