Social stratification
Differences in status gradually developed in the chiefdoms, which led to the development of centralized socio-political organisations. The first centralized organisations may have been temporary pantribal warrior associations, the greatest evidence being in the Danubian area, where barbarian groups organised around military chiefs to raid Byzantine territory and to defend themselves against the Pannonian Avars. Social stratification gradually developed in the form of fortified, hereditary chiefdoms, which were first seen in the West Slavs areas. The chief was supported by a retinue of warriors, who owed their position to him. As chiefdoms became powerful and expanded, centres of subsidiary power ruled by lesser chiefs were created, and the line between powerful chiefdoms and centralised medieval states is blurred. By the mid-9th century, the Slavic elite had become sophisticated; it wore luxurious clothing, rode horses, hunted with falcons and travelled with retinues of soldiers.