Bosnia (region)
Bosnia (/Босна; ) is the northern region of Bosnia and Herzegovina, encompassing roughly 81% of the country; the other eponymous region, the southern part, is Herzegovina. "Bosnia" is an informal term for the whole country.
Kingdom of Bosnia
The Banate of Bosnia was a medieval state comprising at its peak most of what is today Bosnia and Herzegovina, as well as parts of Dalmatia (in Croatia), Serbia and Montenegro. Although nominally in vassalage to the Kingdom of Hungary, Bosnia was a de facto independent state. The Banate of Bosnia existed until 1377, when it was elevated into a kingdom with the coronation of Tvrtko I.