What year was the province of Bosnia and Herzegovina Annexed by Austria Hungary
In a document sent to Frederick III on January 20 , 1448 , Bosnian duke Stjepan Vukčić Kosača called himself " Herzog ( duke ) of Saint Sava , lord of Hum and Primorje , great duke of the Bosnian kingdom " and so the lands he controlled became ( much later ) known as " Herzog ’s lands " or " Herzegovina " .