Peter August Friedrich, Duke of Schleswig-Holstein-Sonderburg-Beck was a Duke of Schleswig-Holstein-Sonderburg-Beck.
Background
He was the fifth and youngest son of Frederick Louis, Duke of Schleswig-Holstein-Sonderburg-Beck and his wife Duchess Luise Charlotte of Schleswig-Holstein-Sonderburg-Augustenburg. lieutenant had been inherited by his father"s older brother, Duke August (1652–1689), and nephew Frederick William I (1682–1719), and was then sold by the latter"s widow to Peter August"s older brother, Duke Frederick William II (1687–1749), in 1732.
Career
Born in Königsberg, Brandenburg-Prussia, Peter August became Governor General of Reval (Tallinn), Governor of Estonia, and a Field Marshal in the Russian Imperial Army. He died in Reval. He was only the titular duke, because he did not inherit the domain of Beck. But he re-sold it in 1745 to Baroness Magdalena von Ledebur-Königsbrück.
Thus, by the time that Peter August became the head of this cadet branch of the Danish royal dynasty, he was "Duke of Schleswig-Holstein-Sonderburg-Beck" in name only.
He is the male line ancestor of Margrethe II of Denmark, Harald V of Norway and Charles, Prince of Wales. Titles and styles 7 December 1697 – 21 February 1772: His Serene Highness The Prince of Schleswig-Holstein-Sonderburg-Beck 21 February 1772 – 22 September 1774: His Serene Highness The Hereditary Prince of Schleswig-Holstein-Sonderburg-Beck 22 September 1774 – 24 February 1775: His Serene Highness The Duke of Schleswig-Holstein-Sonderburg-Beck.