Who married Ursula Anna von Dohna-Schlodien-Carwinden?

Frederick William II, Duke of Schleswig-Holstein-Sonderburg-Beck (18 June 1687 – 11 November 1749) was a Duke of Schleswig-Holstein-Sonderburg-Beck. He served as Prussian field marshal and was appointed Governor of Berlin, but never filled the latter position.

Frederick William II was the eldest son of Duke Frederick Louis (1653–1728) and his wife Louise Charlotte of Schleswig-Holstein-Sonderburg-Augustenburg (1658–1740). His siblings included Dorothea, Peter August and Charles Louis. In 1728, Frederick William II succeeded his father as Duke of Schleswig-Holstein-Beck. After his death, he was succeeded by his son Frederick William III, who fell in battle in 1757. The title was then inherited by Frederick William II's brother, Charles Louis.