Joachim Ernest Duke of Schleswig-Holstein-Sonderburg-Plön Tags: Noble.Joachim Ernest of Schleswig-Holstein-Sonderburg-Plön (1595 – 1671) also Joachim Ernest of Schleswig-Holstein-Plön was the first Duke of Schleswig-Holstein-Sonderburg-Plön which emerged from a division of the Duchy of Schleswig-Holstein-Sonderburg. birth date 1595-08-29 birth place Denmark, Sønderborg death date 1671-10-05 death place Germany, Plön parent John II Duke of Schleswig-Holstein-Sonderburg, Agnes Hedwig of Anhalt spouse Dorothea Augusta of Schleswig-Holstein-Gottorp Learn more... Loading...