Charles Frederick, Duke of Holstein-Gottorp - Wikipedia
File:Royal Monogram of Frederick IV, Duke of Holstein-Gottorp.svg - Wikimedia Commons
Duke of Holstein-Gottorp - Wikipedia
Frederick IV, Duke of Holstein-Gottorp - Wikipedia
Christian Albert, Duke of Holstein-Gottorp - Wikipedia
John Adolphus, Duke of Schleswig-Holstein-Sonderburg-Plön - Wikipedia
Albert, Duke of Schleswig-Holstein | British Royal Family Wiki | Fandom
Adolf, Duke of Holstein-Gottorp - Person - National Portrait Gallery
Charles Frederick, Duke of Schleswig-Holstein-Gottorp - Wikidata
File:David Richter d.y. - Charles Frederick, Duke of Holstein-Gottorp - NMB 2138 - Nationalmuseum.jpg - Wikimedia Commons
August Frederik, Duke of Holstein-Gottorp by Jurgen Ovens Reproduction Painting for Sale
Charles frederick of holstein gottorp hi-res stock photography and images - Alamy
Frederick III, Duke of Holstein-Gottorp - Wikipedia
Duke Christian Albert of Holstein Gottorp and his wife Princess Frederica Amalia of Denmark and Norway - Wikidata
Portrait of Peter Karl Ulrich, Duke of Holstein-Gottorp, later Tzar Peter III by Georg Khristopher Groot on artnet
Portrait of Duke Charles Frederick of Holstein-Gottorp (1700-1739), Anonymous - SuperStock
Frederick III, Duke of Holstein-Gottorp, 1597 - 1659 (from the series Dignitaries at the Peace of Münster) | National Galleries of Scotland
Duke Of Holstein-Gottorp, Karl Fredrik As A Child by David von Krafft - Artvee
Gustav Adolph (1633-1695), Duke of Mecklenburg-Gustrow
David von Krafft | Karl Fredrik, Duke of Holstein-Gottorp as child (1700-1739) | MutualArt
Albert, Duke of Schleswig-Holstein - Wikipedia
Friedrich III, Duke of Holstein-Gottorp (1597-1659) - GAMEO
