Kreva Castle (Template:Lang-be, Template:Lang-lt) is the ruins of a major fortified residence of the Grand Dukes of Lithuania (Gediminas and Algirdas) in the village of Kreva, Belarus. Algirdas's brother Kęstutis was imprisoned and murdered in the Kreva Castle in 1382. Kreva Castle is 220 metres (720 ft) above sea level.[1] The Union of Krewo (Act of Krewo), the first step towards the Polish–Lithuanian Commonwealth, was signed in the castle three years later. The castle was sacked by the Crimean Tatars in the early 16th century and stood unoccupied for a long time. By the 19th century, much of the walls had crumbled away. The World War I dealt a final blow to the decaying structure, since the castle stood on the front line between Russian and German armed forces. In 19th and 20th centuries, the ruins were partially conserved, particularly by Poland in 1929. However, the monument crumbles further.
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