Peter August Friedrich, Duke of Schleswig-Holstein-Sonderburg-Beck (7 December 1697 – 22 March 1775) was a Duke of Schleswig-Holstein-Sonderburg-Beck. He was named after the Russian tsar Peter the Great, who stood by proxy as his godfather after Duke Frederick asked him to do so. It was one of the first family ties established between the Eastern Orthodox Romanov dynasty and Protestant rulers of Europe, predating the German marriages of Peter's own children and nieces.
Army career
Peter August became Governor General of Reval (Tallinn), Governor of Estonia, in the Russian Empire, and a Field Marshal in the Russian Imperial Army. But he re-sold it in 1745 to Baroness Magdalena Dorothea von Ledebur-Königsbrück (). Thus, in time Peter August became the head of this cadet branch of the House of Oldenburg, he was Duke of Schleswig-Holstein-Sonderburg-Beck in name only.
Marriages and issue
Peter August married Princess Sophie of Hesse-Philippsthal, the daughter of Philip, Landgrave of Hesse-Philippsthal and Countess Katharina Amalie of Solms-Laubach, at Rinteln on 5 September 1723.
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|1= 1. Peter August, Duke of Schleswig-Holstein-Sonderburg-Beck
|2= 2. Frederick Louis, Duke of Schleswig-Holstein-Sonderburg-Beck
|3= 3. Louise Charlotte of Schleswig-Holstein-Sonderburg-Augustenburg
|4= 4. August Philipp, Duke of Schleswig-Holstein-Sonderburg-Beck
|5= 5. Marie Sibylle of Nassau-Saarbrücken
|6= 6. Ernest Günther, Duke of Schleswig-Holstein-Sonderburg-Augustenburg
|7= 7. Augusta of Schleswig-Holstein-Sonderburg-Glücksburg
|8= 8. Alexander, Duke of Schleswig-Holstein-Sonderburg
|9= 9. Dorothea of Schwarzburg-Sondershausen
|10= 10. William Louis, Count of Nassau-Saarbrücken
|11= 11. Anna Amalia of Baden-Durlach
|12= 12. Alexander, Duke of Schleswig-Holstein-Sonderburg (= 8)
|13= 13. Dorothea of Schwarzburg-Sondershausen (= 9)
|14= 14. Philip, Duke of Schleswig-Holstein-Sonderburg-Glücksburg
|15= 15. Sophie Hedwig of Saxe-Lauenburg