Later the Baruth branch also purchased the estates of Golßen and Casel in the March of Lusatia and, in 1767, Kliczków Castle (Klitschdorf) in Silesia which became their main seat.
They owned Baruth and the other estates from 1615 to 1945 (when they were expropriated in communist East Germany), including the manor houses, ten villages and about 15,000 hectares of agriculture and forestry land.
In 1815, when Saxony was punished at the Congress of Vienna for its loyalty to Napoleon by the confiscation of a significant part of its territory, the March of Lusatia, including Solms-Baruth, was transferred to the Kingdom of Prussia.
Count Friedrich zu Solms-Baruth (1821–1904) was elevated to the hereditary rank of a Fürst (Prince) by the King of Prussia in 1888.
Prince Friedrich zu Solms-Baruth (1886–1951) was not a member of the Kreisau Circle, dissidents who opposed Hitler's Nazi regime.