into the ownership of Michał Hieronim Radziwiłł in the late 18th century. He had its interior furnished with rococo and early classicist ornaments designed by Szymon Bogumił Zug. The next owner was his son Antoni Radziwiłł. During the ownership of Janusz Radziwiłł (1880–1967), the palace became a meeting place for many eminences in the interwar period, and during the German occupation in World War II, a meeting point for the Home Army, a Polish resistance movement. After the war, the estate was expropriated by the Polish state and became subsidiaries of the National Museum in Warsaw. Dubingiai Castle – A masonry castle acquired in 1508 by Jerzy and later reconstructed by the family in the Renaissance style, it was the main seat of the Biržai-Dubingiai line until the second half of the 17th 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. During the Polish-Swedish wars, the castle was pillaged by armies loyal to the King of Poland and was confiscated from Bogusław. It returned to the family in the second half of the 17th century. Before 1620, a mausoleum was additionally built near the castle by Janusz I. The remains of several family members, including Mikołaj "the Black", his wife Elżbieta Szydłowiecka, Mikołaj "the Red", and those of its creator, Janusz I, were recently found to be interred there. The neglected castle and church gradually fell into ruins, which were sold to Michał Tyszkiewicz in 1808. Lubcha Castle – A fortified residence that passed into the hands of Janusz II, it was expanded to have an additional three stone towers. In 1655, it was seized and devastated by Cossacks under the command of Ivan Zolotarenko during the Russo-Polish war. It was then passed to another set of owners. Radziwiłł Palace in Vilnius – Mikołaj "the Black"'s wooden Vilnius mansion was likely on the same site. Still, the current building was constructed by order of Janusz from 1635 until 1653. During the various wars in the late 17th century, the palace was unoccupied. In 1807, Dominik Hieronim donated the property to the Philanthropist Society. It was further devastated during World War I, and only the northern wing of the palace survived. Today, a division of the Lithuanian Art Museum is located there, on Vilniaus Str. 22. In one hall, one can