Frederick IV was the reigning Duke of Holstein-Gottorp.
Anonymous portrait, 17th–18th century
Hedvig Sophia of Sweden
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Hedvig Sophia Augusta of Sweden, Duchess of Holstein-Gottorp, was the eldest child of Charles XI of Sweden and Ulrike Eleonore of Denmark. She was heiress presumptive to the Swedish throne from her bi
Frederick IV of Holstein-Gottorp
…Castle as the elder son of Duke Christian Albert of Holstein-Gottorp and Princess Frederica Amalia of Denmark. He was married on 12 May 1698 to Princess Hedwig Sophia of Sweden and they had an only child, Charles Frederick, who eventually fathered the future Tsar Peter III of Russia, therefore making Frederick a patrilineal…
Princess Hedvig Sofia by David von Krafft.
Painting of Princess Hedvig Sofia of Sweden and her brother, the future Charles XII of Sweden.