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Trakai Island Castle (Lithuanian: Trakų salos pilis) is an island castle located in Trakai, Lithuania on an island in Lake Galvė. The castle is sometimes referred to as “Little Marienburg”. The construction of the stone castle was begun in the 14th century by Kęstutis, and around 1409 major works were completed by his son Vytautas the Great, who died in this castle in 1430. Trakai was one of the main centres of the Grand Duchy of Lithuania and the castle held great strategic importance.
Trakai Island Castle was built in several phases. During the first phase, in the second half of the 14th century, the castle was constructed on the largest of three lake islands by the order of Grand Duke Kęstutis. During the second phase, two wings were added, and on the southern side a 6-storey (35-metre or 115-foot high) donjon was built. The expansion of the forecastle in the early 15th century marked the third phase of Trakai’s development.