Medieval history of the Balkans

Zachlumia or Zachumlia (, ), also Hum, was a medieval principality located in the modern-day regions of Herzegovina and southern Dalmatia (today parts of Bosnia and Herzegovina and Croatia, respectively). In some periods it was a fully independent or semi-independent South Slavic principality. It maintained relations with various foreign and neighbouring powers (Byzantine Empire, First Bulgarian Empire, Kingdom of Croatia, Principality of Serbia) and later was subjected (temporarily or for a longer period) to Kingdom of Hungary, Kingdom of Serbia, Kingdom of Bosnia, and at the end to the Ottom

The ''''' (in Latin) or ''''' (various forms in Greek) were early Slavic tribes that raided, invaded and settled in the Balkans in the Early Middle Ages and eventually became one of the progenitors of modern South Slavs. They were mentioned by early Byzantine chroniclers as barbarians having appeared at the Byzantine borders along with the Antes (East Slavs), another Slavic group. The Sclaveni were differentiated from the Antes and Wends (West Slavs); however, they were described as kin. Eventually, most South Slavic tribes accepted Byzantine or Frankish suzerainty, and came under their cultur