Sierhagen Manor

The Sierhagen Estate, originally the Wendish noble castle Syra, or Zyra, is an estate in the municipality of Altenkrempe near Neustadt (Holstein) in the Bay of Neustadt. The first mention of Sierhagen (Syra) occurred in the 12th century.

Around 1304, Syra was owned by Volrad and his brothers from the Syra family. Around 1316, a Lübeck document states that the "Fortress Syraa" was owned by the "mighty knights Marquard and Eccard von Westensee," who also held Grömitz, Körnik, and half of Schlammin (from the noble Westensee family, an old leading Holstein lineage with a squirrel in their coat of arms) through a fief granted by Gerhard III.

From the Middle Ages until beyond the mid-17th century, Gut Sierhagen was, with minor interruptions, owned by the Schleswig-Holstein noble family Buchwaldt. In 1666, the Counts Dernath were lords of Sierhagen for two generations. They were followed by the noble family Brockdorff. In 1765, Wulf Heinrich von Thienen acquired Sierhagen, later bequeathing it to the Plessen family (later Scheel von Plessen or Scheel-Plessen), in whose possession it has been since 1809. Carl von Scheel-Plessen and Victor Baron von Plessen were born on the estate.