Frederick Charles, Duke of Schleswig Holstein Sonderburg Pl%C3%B6n

Frederick Charles of SchleswigHolsteinSonderburgPln , known as Friedrich Karl or Friedrik Carl of HolsteinPln, was a member of a cadet branch of the Danish royal family and the last duke of the Duchy of SchleswigHolsteinSonderburgPln , a Danish royal prince, and a knight of the Order of the Elephant. When he died without a male heir born of his marriage to Countess Christine Armgard von Reventlow, rule of the Duchy of HolsteinPln returned to the Danish crown.

Frederick Charles was born on August 4, 1706, at Snderborg castle, the posthumous and only son of Christian Charles , a brother of Duke Joachim Frederick of SchleswigHolsteinSonderburgPln. That duke died in 1722 without closer male heirs than his nephew, who in time succeeded his uncle as partitionedoff duke of SchleswigHolsteinSonderburgPln.

Source: Wikipedia