Slavonian Banate. Bosnian bans and kings, starting with 1324 and Stephen II Kotromanić, who reclaimed Usora, and added both Usora and Soli to his title have relinquished direct rule over Land of Usora and started appointing their vassals as rulers, ending with the last Duke of Usora, Tvrtko Stančić, who died in May 1463 during Ottoman conquest of Bosnia. Religion On its territory Bosnian Church flourished since the 13th century, strongly supported by local nobility. The Church held spacious land possessions, located between Dobor, in the south, and Dubnica near the Sava, in the north. Presence of Christian slavery was outlawed and frowned upon in Southeastern Europe, however, there are numerous documents citing free sales of Usoran women and children on the slave-markets of Dubrovnik Republic, as late as the mid 15th century, as they were considered adherents of heretical Bosnian Church and thus, non-Christian in the official canonical view. Economy Because of its geographical location, descending from the region of low hills in its south ends and spreading through north-Bosnian lowlands into the fertile Pannonian plains towards the Sava River, Usora had rich agriculture based economy. The Sava was always frequent trading route, and had rich fisheries. This economic potential, more often than not, made Usora most common battleground between Bosnians and the Hungarian kings who viewed them as subordinate. Usora was also famous for well developed falconry among its nobility. List of rulers 1190s-1220: Stjepan, Ban of Bosnia, likely also ruled Soli, first historically documented ruler of Usora; 1220-1241: Sibislav, son of ban Stjepan, supported Hungary in its crusade against Bosnian Church; 1241–1247: Matej Ninoslav, the Ban of Bosnia, waged defensive war against Hungary, and after the loss of Usora to Hungarians, he remained the ban of all other Bosnian lands until his death in 1250; 1322-1329: Stjepan II, also ban of Bosnia, grandson of Vladislav; from 1322, when Stephen II Kotromanic became a ban of Bosnia, Usora was part of his realm and was included in the titles of all subsequent bans and kings in Bosnia; 1329-1353: Vojko, Duke of Usora (land of Soli absorbed into Usora as župa Soli by 1330), Bosnian nobleman and vassal to Stjepan II, ban of Bosnia; 1353-1377: Tvrtko Ivanić, Duke of Usora, Bosnian nobleman and vassal to the first Bosnian King Tvrtko I Kotromanić; 1377-1395: Vlatko Tvrtković, son of Duke Tvrtko of Usora, Bosnian nobleman and vassal to king Tvrtko I;