How did Bosnia become an independent political entity after 1180?

Following the death of the Byzantine emperor Manuel I Comnenus in 1180, Byzantine influence in the region waned. Because control by neighboring Croatia or Hungary was not restored at that time, a Bosnian territory—initially excluding much of modern Bosnia and all of Herzegovina—emerged as an independent political entity for the first time.1

This independence was solidified under the rule of Ban Kulin, who governed from approximately 1180 to 1204. During Kulin’s tenure, Bosnia functioned as a largely independent state, experiencing a period of relative peace and prosperity through increased trade. Although the kingdom of Hungary maintained a theoretical claim to sovereignty over the region, a Bosnian state persisted throughout most of the period between 1180 and 1463, characterized by its isolation and protection by impenetrable terrain.21