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Frederick III of Holstein-Gottorp, lived 1597 –1659), a Duke of Holstein-Gottorp. Elder son of Duke Johann Adolf of Holstein-Gottorp and Augusta of Denmark, a daughter of King Frederick II of Denmark. Married Duchess Marie Elisabeth of Saxony. A maternal 2X great-grandfather of Catherine the Great.
Frederick II of Denmark (1534 - 1588). King of Denmark and Norway from 1559 until he died in 1588. He married Sophie of Mecklenburg-Güstrow and had six children. He was hot-headed, vain, courageous, and ambitious.
Frederike Amalia,Duchess von Holstein-Gottorp, Princess of Denmark.