Karl, Hereditary Prince of Mecklenburg-Güstrow

Karl, Hereditary Prince of Mecklenburg-Güstrow (18 November 1664 – 15 Mairch 1688) was the Hereditary Prince of Mecklenburg-Güstrow. He was a son of Gustavus Adolph and his wife Princess Magdalene Sibylle of Holstein-Gottorp, a daughter of Friedrich III. Karl never succeeded his father as Duke as he died from smallpox aged 23 in 1688

Marriage
Karl married on 10 August 1687 in Potsdam to Marie Amalie of Brandenburg, a daughter of "Great Elector" Friedrich Wilhelm of Brandenburg. The marriage remained childless. He died unexpectedly of smallpox. He was the last surviving son of his father, and his wife lost her child when she learned of his fate, so that the Mecklenburg-Güstrow line died out when his father died in 1695.