The first masonry castle in Dubingiai was constructed by Vytautas, Grand Duke of Lithuania, in 1412-1413 on an island, now apeninsula, in Lake Asveja in order to secure the capital Vilnius from attacks from Livonia. No accounts concerning the architecture of Vytautas' castle have survived. It was acquired by Jerzy Radziwiłł prior to 1508. He constructed a new palace in the Renaissance style in the first half of the 16th century. After the death of Jerzy, his son Mikolaj 'the Red' inherited the property, causing the town nearby to become an important hub for the Reformation in Lithuania. Barbara Radziwiłł spent five months in the castle after her marriage to Sigismund Augustus in 1547. The palace used to be one of the most luxurious residences in the Duchy, lagging not much behind the Royal Palace. Dubingiai Castle was the main seat of the Biržai-Dubingiai line of the Radziwiłł family until the second half of the 17th century, when it was transferred to Biržai Castle.
During the Polish–Swedish wars, the castle was pillaged by armies loyal to the King of Poland and was confiscated fromBogusław Radziwiłł. It returned to the family in the second half of the 17th century. The neglected castle and church gradually fell into ruins. It was sold to Michał Tyszkiewicz in 1808. Today only the foundations and several cellars of the castle and church remain and are being researched.
The masonry Calvinist Church of the Holy Spirit was built in the Renaissance style near the castle by Janusz Radziwiłłprior to 1620 and was intended to be the mausoleum of the Radziwiłł family. The most prominent members of the family were interred there, including Mikołaj 'the Black' Radziwiłł (1565) and his wife Elżbieta Szydłowiecka (1562), Mikołaj 'the Red' Radziwiłł (1584) and Janusz Radziwiłł (1620). Their remains were discovered during archaeologicalexcavations in 2004 and reburied there in 2009.
References:The Chapel of St. Martin is the only completely preserved Romanesque building in Vyšehrad and one of the oldest in Prague. In was built around 1100 in the eastern part of the fortified outer ward. Between 1100 and 1300, the Rotrunda was surrounded by a cemetery. The building survived the Hussite Wars and was used as the municipal prison of the Town of the Vyšehrad Hill.
During the Thirty Years’ War, it was used as gunpowder storage, from 1700 to 1750, it was renovated and reconsecrated. In 1784, the chapel was closed passed to the military management which kept using it as a warehouseand a cannon-amunition manufacturing facility. In 1841, it was meant to be demolished to give way to the construction of a new road through Vyšehrad. Eventually, only the original western entrance was walled up and replaced with a new one in the sountren side. The dilapidating Rotunda subsequently served as a shelter for the poor.