Eutin Castle was built in the12th century by the Bishop of Lübeck but unfortunately none of the medieval buildings are preserved to the present day.
In 1586 Prince-Bishop Johann Adolf, Duke of Schleswig-Holstein, began developing the castle into an impressive residence, but in 1689 most of it was destroyed by fire. Between 1717 and 1727 Prince-Bishop Christian August, grandfather of the Russian Tsarina Catherine the Great, rebuilt the castle in Baroque style. Swedish-German Rudolf Matthias Dallin was the architect and Johann Christian Lewon laid out an imposing French-style garden. Between 1787 and1803 the garden was transformed into an English landscape garden.
In 1773 the Duke of Oldenburg was granted the Duchies Delmenhorst and Oldenburg and Eutin became his summer residence. In 1992 the Eutin Castle Trust was founded and since then it has been a museum.