About Joachim Frederick, Duke of Schleswig-Holstein-Sonderburg-Plön
Joachim Frederick of Schleswig-Holstein-Sonderburg-Plön (9 May 1668, Magdeburg – 25 January 1722, Plön) (German: Joachim Friedrich), also known as Joachim Frederick of Schleswig-Holstein-Plön, was the third Duke of Schleswig-Holstein-Plön, a dukedom created by the division of the Duchy of Schleswig-Holstein-Sonderburg.