The name ''Herzegovina'' means "herzog's land", and “herzog” derives from the German word for "duke". It originates from the title of a 15th century Bosnian magnate, Stjepan Vukčić Kosača, which was "Herceg Herzog of Hum and the Coast" (1448). Hum (formerly called Zachlumia) was an early medieval principality that had been conquered by the Bosnian Banate in the first half of the 14th century. When the Ottomans took over administration of the region, they called it the Sanjak of Herzegovina (''Hersek''). It was included within the Bosnia Eyalet until the formation of the short-lived Herzegovina Eyalet in the 1830s, which remerged in the 1850s, after which the administrative region became commonly known as ''Bosnia and Herzegovina''.