headed by the Czartoryski family. After the three partitions of the Polish–Lithuanian Commonwealth in the late 18th century, towns and estates owned by the Radziwiłłs became parts of territories that belonged to Russia, Prussia and Austria. However, all three states recognized the title of princes of the Radziwiłł dynasty and the rights of its members at the family properties. In addition, many members of the Radziwiłł family held high civil and military posts. They had family ties with the Dukes of Castellane, the Clary-Aldringen and Sayn-Wittgenstein princes and most importantly with Frederick William II, King of Prussia and his son Frederick William III. Prince Antoni Radziwiłł of the Kletsk line married Princess Louise of Prussia, a daughter of Prince Augustus Ferdinand of Prussia and hence a first cousin of King Frederick William II. This relation helped Antoni to release the vast properties of Nieśwież and Olyka from Russian seizure in 1815, after his cousin, Dominik of the Nieśwież line had fought and died on Napoleons' side in the Polish Legion, and Alexander I of Russia had therefore confiscated his whole property. After the Congress of Vienna, the inheritance was partially given to Antoni. The couple were prominent patrons of the arts in Berlin during the early 19th century. At their Berlin residence, the Radziwiłł Palace, they hosted well-known personalities, artists and academics, playing a major role in promoting the Prussian-Polish relationship in Berlin. These included Polish politicians in the Prussian Parliament or such famous people as Johann Wolfgang von Goethe, Frédéric Chopin, Wilhelm and Alexander von Humboldt, Felix Mendelssohn Bartholdy and Karl Friedrich Schinkel. In fact, the "Salons" held by the Radziwiłłs were so popular that they became a symbol of "Polish Berlin". Prince Ferdynand Radziwiłł - like Wilhelm von Humboldt, Goethe, Felix Mendelssohn Bartholdy and many further notable personalities - also was a member of the Sing-Akademie zu Berlin where people from all walks of life and classes in Berlin came together to study and practice choral music. Although most of their largest estates were located in Russian Poland, the close relation with the Royal House of Prussia caused the family to preferably live at the Berlin court, using their influence, than in Warsaw or St. Petersburg, given their experience with the Czar's seizure of most of the family's property in 1813. Moreover, Michał Gedeon Radziwiłł was the commander-in-chief of the November uprising of 1830–31. Elisa Radziwill, a daughter