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Stjepan Vukčić Kosača (Serbian Cyrillic: Стјепан Вукчић Косача; 1404–1466) was the most powerful Bosnian nobleman whose active political career spanned the last three decades of medieval Bosnian history, from 1435 to 1465. During this period, three kings succeeded to the Bosnian throne, Tvrtko II, Thomas (Tomaš), Stephen Tomašević (Stjepan Tomašević), one anti-king, Radivoj, the older brother of King Thomas, and the county's fate was sealed by the Ottoman conquest.