Stjepan Vukčić Kosača (Cyrillic Стјепан/Стефан Вукчић Косача; 1404–1466) was a Bosnian duke that ruled a hereditary region in Hum initially under King Stephen Thomas then semi-independently under the Ottoman Empire Aragon and again the Ottoman Empire which was known as the Duchy of Saint Sava. He was a member of the Kosača noble family. It was Stjepan’s ducal title Herzog that gave rise to the names Herzegovina and Herceg Novi.
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