The countries' royals annually reviewed are as follows, with the key developments over the year outlined afterwards:
Existing hereditary monarchies: Great Britain, Norway, Denmark, Sweden, Netherlands, Belgium, Luxembourg, Liechtenstein, Spain, Monaco.
Former monarchies: Russia, Romania, Bulgaria, Greece, Albania, Serbia, Montenegro, Austria, Germany, Italy, Portugal, France.
2015
- Seven years after experiencing a severe car crash, since which he had made intermittent progress but ultimately fell back into a coma, Prince Kardam, who would have been heir to the Bulgarian throne, dies due to a lung infection whilst in a coma. This means that his son, Prince Boris, has succeeded him as heir to the current claimant to the Bulgarian throne, the former Tsar Simeon II of Bulgaria.
- The Bulgarian Orthodox Church states that it will from now on always recognise and refer to the former Tsar Simeon II of Bulgaria as “King of Bulgaria”.
- King Harald V of Norway becomes the world’s first reigning monarch to visit Antarctica, when he goes to the Norwegian dependency, Queen Maud Land.
- The former King Michael of Romania has removed the right of his grandson, Nicholas, to call himself Prince of Romania; seen by some as an attempt to strengthen the anticipated continuation of the former King Michael's claim to the defunct Romana throne by his eldest daughter and heir, Crown Princess Margarita.
- An opinion poll in the Serbian newspaper, Blic, shows 49.8% of Serbs would support a restoration of the Monarchy under a prospective King Alexander II of Serbia, with 44.6% against.
- King
Felipe VI of Spain announces he will cut his salary by 20%.
- Queen
Elizabeth II of Great Britain & Northern Ireland becomes the longest-reigning monarch in British
history, and longest-reigning queen regnant in world history.