Herman Wrangel was born, into the Wrangel family, at Salsta Palace in Uppland, Sweden, the son of Count Fredrik Ulrik Wrangel af Sauss and the Countess Ulrika Ebba Vilhelmina Sprengtporten.[1][2]
Wrangel was attache at the Ministry for Foreign Affairs, serving in Copenhagen and Paris 1884. He was made second secretary at the Ministry for Foreign Affairs 1885, chamberlain and acting vice master of ceremonies 1887, first secretary at the Ministry for Foreign Affairs 1889, acting secretary of the Swedish legation in Paris 1890–1896 and then secretary in Paris 1896–1900, Envoy Extraordinary and Minister Plenipotentiary at Brussels and The Hague 1900, at Saint Petersburg 1904, and at London 1906. Minister for Foreign Affairs 1920–1921.[1]
He married in 1893 in Bordeaux, France, Louise Charlotte Suzanne Baour (1869–1940) the daughter of Charles Baour and Marguerite Guestier. Their son Oskar Fredrik Ulrik Louis Wrangel af Sauss was born in Paris on 23 January 1895, and died unmarried at the age of 32 at Chateau de Villambis in France on 9 January 1928.[1][2]