Anna of Holstein-GottorpAnna of Holstein-Gottorp was a noblewoman from the Holy Roman Empire, member of the House of Holstein-Gottorp by birth and House of Hesse by marriage.Early lifeAnna was born as the seventh child and fourth daughter of Duke Adolf of Holstein-Gottorp and his wife, Landgravine Christine of Hesse.Personal lifeOn 28 January 1598, she married Count Enno III of Ostfriesland, elder son of Count Edzard II of Ostfriesland and his wife Princess Katarina of Sweden, eldest daughter of King Gustav I of Sweden. He was previously married to Countess Walburgis of Rietberg. They had the following children: Anna Maria, Countess of Ostfriesland, married Adolf Frederick I, Duke of Mecklenburg-Schwerin Rudolf Christian, Count of Ostfriesland Ulrich II, Count of Ostfriesland