King-Emperor Leopold III of the Belgians, and Leopold I of the United Kingdom of the Netherlands: head of state of Belgium from 1934 and of the whole Netherlands from 1951, including those countries' empires. Married first to Princess Astrid, niece of Gustav V of Sweden, and second to Princess Lilian, a commoner
Prince Imperial Simeon, Prince of Macedonia: heir to the throne of Bulgaria, styled the Prince of Macedonia
Carl Eduard, Duke of Saxe-Coburg and Gotha: President of the German Red Cross and member in good standing of the NSDAP and SS.
Maxime Weygand, Marechal de France: head of state of France from 1951 to 1958, Weygand is the grandson of Leopold I of the Belgians, being the illegitimate child of either Leopold II or his sister Charlotte, Empress of Mexico. His rule in France was jokingly referred to as the 'Third Empire'.