Christian Augustus of Holstein-Gottorp-Eutin was a cadet of the reigning ducal House of Holstein-Gottorp who became prince-bishop of Lübeck and regent of the Duchy of Holstein-Gottorp.
Portrait of Christian August, c. 1710
Christian Albert was a duke of Holstein-Gottorp and bishop of Lübeck.
Christian Augustus of Holstein-Gottorp, Prince of Eutin
…He was the father of Adolf Frederick, King of Sweden, and the maternal grandfather of Catherine the Great, Empress of Russia. He was a younger son of Christian Albert, Duke of Holstein-Gottorp and Princess Frederica Amalia of Denmark, daughter of King Frederick III of Denmark. His elder brother, Frederick IV, succeeded their father as ruler…
Portrait by David Klöcker Ehrenstrahl
The duke and his wife Frederica Amalia.