Gustaf Archibald Siegwart Douglas (born 3 March 1938) is the oldest son of count Carl Ludvig Douglas (26 July 1908 Stjärnorp - 21 January 1961 Rio de Janeiro), a Swedish nobleman and diplomat who was Royal Swedish Ambassador to Brazil, and his Prussian wife Ottora Maria Haas-Heye (13 February 1910 Partenkirchen - 17 July 2001).
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