Prince Berthold, Margrave of Baden

Berthold Prinz und Markgraf von Baden, styled Margrave of Baden and Duke of Zähringen, was the head of the House of Baden, which had reigned over the Grand Duchy of Baden until 1918, from 1929 until his death. He was the brother-in-law of Prince Philip, Duke of Edinburgh, through his marriage to Philip's sister, Princess Theodora of Greece and Denmark.