sentences:  From about 1156 the Griffin duke Bogusław I, elder son of the first Pomeranian sovereign Wartislaw I, ruled in Pomerania around Szczecin.He fought against the Saxon duke Henry the Lion in the 1164 Battle of Verchen, was defeated, and became Henry's liensman.When in 1180 Henry was deposed by Emperor Frederick Barbarossa, Bogusław appeared at the emperor's camp near Lübeck and was enfeoffed with "Slavinia".