Jezeří Castle

Jezeri Castle (Eisenberg Castle) was built from 1363 to 1365. Thereafter, several nobles owned the castle, including the Smolik von Slawitz family. From 1450 onwards, Kunz von Kauffungen also owned the castle. He became known when he robbed the Saxon princes Albert and Ernst (later founders of Thuringia and Saxony) from Altenburg Castle, because he felt betrayed by the Saxon margrave. After a charcoal burner had betrayed him, he was executed in Freiberg. In 1459 the castle was conquered by the Bohemian King and fell back to the Smolik. Since he remained childless, the castle fell to his brother-in-law. He had the castle rebuilt into a renaissance castle in 1549. Because of participating in the uprising of the nobility, he was expropriated and taken over by Wilhelm Lobkowicz in 1623, who had the palace converted into a baroque palace. The castle was destroyed by the Thirty Years War. The descendants of the Lobkowicz rebuilt it. In 1713 the castle burned down again, was rebuilt and used as a hunting lodge.
During the Second World War, officers of the Allied army were held captive in the castle. After World War II until 1948 it came back into the possession of the Lobkowicz family. In 1948 they were expropriated. From 1950 it served as accommodation for the Czechoslovak army. It has been a listed building since 1958. In 1987 the lock was to give way to brown coal. Thanks to a citizens' initiative, the castle was saved and has been open to the public again since 1996.
Source Wikipedia

The castle, on the walls of which the present castle stands, was founded in the years 1363-1365.

The castle is decaying and is unfortunately also closed at the moment (spring 2022) ... An English-style park (unfortunately also decaying) stretches around the castle. - The Lobkowitz family (the lords of the castle): one of the oldest and richest Bohemian noble families (also in Dux).
In the middle of the 18th century, one of the lords of Lobkowicz planned to build a chapel for a relic, the Holy Thorn (from Christ's crown of thorns), which was kept in the castle chapel. About 500m below the castle - don't miss it!