Ahrensbök Charterhouse (Kartause Ahrensbök) was a former Carthusian monastery, or charterhouse, in Ahrensbök in Holstein, Germany.
In Ahrensbök on 28 February 1625 Christian married his cousin Eleonore Sophie (b. Sonderburg, 14 February 1603 - d. Ballenstedt, 5 January 1675), daughter of John II, Duke of Schleswig-Holstein-Sonderburg-Plön, by his second wife Agnes Hedwig of Anhalt (sister of his father Christian I) and also by birth a princess of Denmark as a granddaughter in the male line of King Christian III.
Gnissau is a small village in the district Ostholstein in Schleswig-Holstein, Germany, part of the municipaality of Ahrensbök.
In addition to the new residence town of Plön his estate included Ahrensbök and Reinfeld.
He was born on 8 April 1634 in Ahrensbök, the eldest son of the first Duke of Plön, Joachim Ernest and Dorothea Augusta of Schleswig-Holstein-Gottorp.
But, he received from Amt Ahrensbök (except the village of Travenhorst), the Prussian parts of the former Principality of Lübeck and was given a million taler as compensation from Prussia.
His domain included inter alia the territories of Sonderburg, Norburg, Ærø, Plön and Ahrensbök together with their assigned Ämter or administrative offices.
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The seat of the duke was Sonderburg, but parts of the domain were located in Denmark (in the Duchy of Schleswig), mainly on the islands of Als and Ærø and around Glücksburg, whilst other lands were part of the Holy Roman Empire (in the Duchy of Holstein), including the Ämter of Plön, Ahrensbök, and Reinfeld.
The territorial centres of Schleswig-Holstein-Plön were the districts (Ämter) of Ahrensbök and Reinfeld established after the Reformation by the merging of the former abbeys at Ahrensbök and Reinfeld.
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The possessions were confiscated, and Plön's castles at Reinfeld, Ahrensbök and Rethwisch were demolished.