sentences:  Usora (region)
  
  Usora (, ) was a semi-independent duchy (Banate) of the medieval Bosnian state, although it also had some periods outside it, when it was connected with neighbouring Banates of Slavonia or Mačva.The administrative seat of this Banate was Srebrenik, which also served as residence of its rulers for entire period of existence of the medieval Bosnian state.