sister cities Schleswig is twinned with: Hillingdon, England, United Kingdom Mantes-la-Jolie, France Vejle, Denmark Waren, Germany Notable people Valdemar I of Denmark (1131–1182), King of Denmark from 1154 until his death in 1182. Christian III of Denmark (1503–1559), King of Denmark Adolf Frederick, King of Sweden (1710–1771), King of Sweden Frederick August I, Duke of Oldenburg (1711–1785), nobleman Asmus Jacob Carstens (1754–1798) a Danish-German painter, committed to German Neoclassicism. Princess Louise Caroline of Hesse-Kassel (1789–1867), matriarch of the House of Schleswig-Holstein-Sonderburg-Glücksburg Herman Wilhelm Bissen (1798–1868), Danish sculptor Friedrich Bernhard Westphal (1803–1844), German-Danish genre painter and illustrator Karl Friedrich Wilhelm Jessen (1821–1889), botanist Frederick VIII, Duke of Schleswig-Holstein (1821–1889), patriarch of the House of Schleswig-Holstein-Sonderburg-Augustenburg Friedrich Krichauff (1824–1904), politician in colonial South Australia Victor Hensen (1835–1924), zoologist Ove H. Berg (1840–1922), American politician and businessman, emigrated to the US in 1881 Julius Friedrich Theodor Engel (1842–1926), judge and politician Hans von Seeckt (1866–1936), military officer Ulrich von Brockdorff-Rantzau (1869–1928), politician and diplomat, first Foreign Minister of the Weimar Republic Christian Hansen (1885–1972), general Hermann-Bernhard Ramcke (1889–1968), General of paratroop forces Bernhard Rogge (1899–1982), naval officer Bernd Kröplin (1944–2019), engineer and academic Ralf Rothmann (born 1953), novelist Thomas Heberer (born 1965), musician and composer Ekkehard Wölk (born 1967), pianist, arranger and composer Sport Jobst Hirscht (born 1948), athlete who competed mainly in the 100 metres Hole Rößler (born 1949), modern pentathlete Jan-Ingwer Callsen-Bracker (born 1984), footballer References External links Official website Towns in Schleswig-Holstein Schleswig-Flensburg