The European 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.
2021
After 73 years of marriage to Queen Elizabeth II of Great Britain and Northern Ireland, Prince Philip (Duke of Edinburgh, born a prince of Greece) dies aged 99.
George, son and heir to the claim of Grand Duchess Maria of Russia to the former Russian throne, marries Italian Rebecca Bettarini in St Petersburg, Russia.
Princess Marie, consort of Prince Hans-Adam II of Liechtenstein, dies aged 81.
