Eutin (German pronunciation: [ɔʏˈtiːn]) is the district capital of Eastern Holstein (German: Ostholstein) located in the northern German state of Schleswig-Holstein. As of 2005, it had some 17,000 inhabitants. The originally Slavonic settlement (Utin) was populated in the 12th century by Dutch settlers. In 1156 Eutin became a market town. City rights were granted in the year 1257. It would later become the seat of the Prince-Bishopric of Lübeck, as Lübeck itself was an imperial free city. When the bishopric was secularized in 1803, Eutin became part of the Duchy of Oldenburg. As a result of the Greater Hamburg Act of 1937, Eutin passed from the Free State of Oldenburg to the Prussian Province of Schleswig-Holstein. After World War II, it became part of the modern Bundesland of Schleswig-Holstein. Eutin is the birthplace of composer Carl Maria von Weber. To honour him, an open air theater (Freilichtbühne) was built in the Eutin Castle's park in 1951 where several operas are performed during July and August during the Eutin Festival. The capacity of this open-air stage is about 2000 people.