The March or Margraviate of Lusatia was an eastern border march of the Holy Roman Empire in the lands settled by Polabian Slavs. It arose in 965 in the course of the partition of the vast Marca Geronis. Ruled by several Saxon margravial dynasties, among them the House of Wettin, the lordship was contested by the Polish kings as well as by the Ascanian margraves of Brandenburg. The remaining territory was finally incorporated into the Lands of the Bohemian Crown in 1367.
Wettin marches of Lusatia and Meissen (pink), about 1260
Polabian Slavs, also known as Elbe Slavs and more broadly as Wends, is a collective term applied to a number of Lechitic tribes who lived scattered along the Elbe river in what is today eastern Germany. The approximate territory stretched from the Baltic Sea in the north, the Saale and the Limes Saxoniae in the west, the Ore Mountains and the Western Sudetes in the south, and Poland in the east.
Primary source about history of Polabian Slavs - Chronica Slavorum of Helmold from the 12th century translated to Polish language by Jan Papłoński in 1862.
Reconstruction of Slavic gord near Neubrandenburg
Reconstruction of Slavic gord at the Burgwallinsel (Gord Island)
Reconstruction of Slavic gord in Groß Raden, Mecklenburg