Rugia with Henry, the Saxon duke enlisted the aid of the Obotrite confederacy and the Liutizi against the Danes; Valdemar ended the conflict by paying Henry in 1171. Alarmed at the expansion of Henry the Lion's power, Emperor Frederick Barbarossa deposed the Saxon duke and redistributed his lands in 1180/81. The withdrawal of Saxon support left the Liutizi and their Pomeranian supporters vulnerable to the Danish fleet. A Slavic fleet attempting to reclaim Rugia was crushed at the Bay of Greifswald on 19 May 1184. Danish monks engaged in missionary activity in Pomeranian abbeys, and Prince Bogislaw I surrendered to King Canute VI in 1185 to become the Danish king's vassal. Pribislav, a Christian prince of the Hevelli, bequeathed his lands to the Saxon Albert the Bear upon his death, thereby leading to the establishment of the Margraviate of Brandenburg. The Lusatian Sorbs remained independent to a large extent. They were temporarily subdued by Charlemagne, but upon his death the links with the Franks were broken. In a series of bloody wars between 929 and 963 their lands were conquered by King Henry the Fowler and his son Otto the Great and were incorporated into the Kingdom of Germany. By the 14th century, the majority of Slavs living there had been Germanized and assimilated. However, the Sorbs, the descendants of the Milceni and the Lusici, have retained their identity within Lusatia, a region divided between the German states of Brandenburg and Saxony. The Slavic language was spoken by the descendants of the Drevani in the area of the lower Elbe until the early 18th century. See also Sukow-Dziedzice group Leipzig group Tornow group Slavic settlement of the Eastern Alps Footnotes References External links Map of the lands inhabited by Polabian Slavs Slavic ethnic groups