Demographic history of Bosnia and Herzegovina of Catholic preachers. Preottoman Catholic population had a great share in the emigrations from Bosnia and Herzegovina. The emigration flows were directed towards Dalmatia, Croatia, Slavonia, Baranja and north-west Bačka. The western part of today's region of Bosnia, today known as Bosnian Krajina, was taken by the Ottomans in the 16th century, and was for some time still known as "Turkish Croatia", as its once overwhelming Catholic and Croat majority disappeared and the Ottomans entrenched the new border along the Sava and Una rivers. After more than a century of military losses, the Habsburg Empire waged some victorious wars against
Serbs of Bosnia and Herzegovina Bosnia and Herzegovina, large parts of modern-day Croatia and parts of modern-day Serbia and Montenegro, with Tvrtko Ieventually establishing the Kingdom of Bosnia in 1377. The Kotromanić intermarried with several southeastern and central European royal houses. The last sovereign, Stephen Tomašević, ruled briefly as Despot of Serbia in 1459 and as King of Bosnia between 1461-63, before losing both countries – and his head – to the Ottoman Turks. The Battle of Bileća was fought in August 1388 between the forces of the Kingdom of Bosnia led by Duke (Voevoda) Vlatko Vuković and the Ottoman Turks under the leadership of