Frederick III of Holstein-Gottorp was a Duke of Holstein-Gottorp.
He was the elder son of Duke Johann Adolf of Holstein-Gottorp and Princess Augusta of Denmark. His mother was a daughter of King Frederick II of Denmark.
He had ambitious plans... Wikipedia
Born: December 22, 1597, Gottorf Castle, Schleswig, Germany
Died: August 10, 1659 (age 61 years), Tönning, Germany
Parents: John Adolf, Duke of Holstein-Gottorp and Augusta of Denmark
Grandparents: Adolf, Duke of Holstein-Gottorp, Frederick II of Denmark, Christine of Hesse, and more
Spouse: Duchess Marie Elisabeth of Saxony (m. 1630–1659)