- Member of the International Olympic Committee (1926-1956). First president of the Nationales Olympisches Komitee für Deutschland (1949-1951).
- Brother of Prince Hendrik of the Netherlands. Uncle of Queen Juliana, Großherzog Friedrich Franz IV von Mecklenburg-Schwerin, and Dronning Alexandrine. Great-uncle of Princess Beatrix of the Netherlands, Frederik IX, and Arveprins Knud. Great-great uncle of King Willem-Alexander, and Prins Constantijn.
- Governor of Togoland (now Togo and parts of Ghana), from June 19, 1912 - August 31, 1914. Wrote "From the Congo to the Niger and the Nile", a two-volume book based on his 1910-1911 African expedition.
- His second wife was the widow of his half-brother.
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