What is "pleissnerland"

Pleissnerland, Pleissenland or the Imperial Territory of Pleissenland (; ) was a Reichsgut of the Holy Roman Empire, which meant that it was directly possessed by the respective elected King of the Romans or Emperor. It was named for the Pleiße River, and was located in what is now the border region between the German states of Thuringia and Saxony south of Leipzig, including the towns of Altenburg, Chemnitz, Zwickau and Leisnig.