Ishak Bey Kraloğlu

Ishak Bey Kraloğlu (Serbo-Croatian: Ishak-beg Kraljević, Исхак-бег Краљевић; died after 1493), christened Sigismund Tomašević (Сигисмунд Томашевић), was a Bosnian prince, a younger half-brother of the King Stjepan Tomašević, and the last known member of the House of Kotromanić. He became an Ottoman statesman after growing up at the Porte in Istambul.

He was captured during the Ottoman conquest of Bosnia in 1463, after which he converted to Islam and became a companion of Mehmed the Conqueror, eventually rising to the post of sanjak-bey.