, a
Ghanaian slave castle constructed by the Swedish Africa Company With the outbreak of the
Thirty Years' War, the demand for weapons in Europe increased enormously. In 1618, De Geer delivered weapons to
Swedish King Gustavus Adolphus. Impressed by his business instincts, the
Swedish government allowed him to lease estates near
Finspång in the province of
Östergötland. Before long, De Geer had established a profitable workshop industry there. In 1623 he was active in a Swedish trading company. The Swedish government continued to support him and De Geer received the official monopoly on the copper and iron trade in Sweden. De Geer, due to his businesses in the country, eventually immigrated to Sweden in 1627. By doing so, he hoped to avoid paying the Dano-Norwegian
Sound Tolls on all foreign merchantmen crossing
the Sound. In 1634, De Geer bought the
Huis met de Hoofden, a
canal house on the
Keizersgracht in Amsterdam. His wife died after giving birth to their sixteenth child. In 1640, De Geer moved to Sweden again and was ennobled by the Swedish Crown. Thanks to his accrued wealth and status as a noble, De Geer was able to purchase three-quarters of leased farmlands on his Östergötland estates. his estate in
Stockholm houses the Dutch embassy in Sweden. In the employ of Swedish statesman
Axel Oxenstierna, De Geer travelled to
Amsterdam to support the Swedish war effort in the
Torstenson War against
Denmark–Norway. Upon the outbreak of war in 1644, De Geer singlehandedly outfitted a fleet of Swedish ships for use against the Danish navy. The fleet contained thirty-two fully manned ships each with a full
marine complement, with which Sweden was able to capture the island of
Fehmarn. == Legacy ==