Karaca Pasha (Karadja Pasha) was the Beylerbeyi of Rumelia during Mehmed the Conqueror's reign and played a role in the Ottoman conquest of Constantinople. His nickname was dayı, meaning "uncle", as he was the brother of the mother of Cem Sultan, one of Mehmed's sons. He made a reputation for himself in the Battle of Varna during the reign of Murad II. He died during the siege of Belgrade in 1456. Karacabey District in Bursa is named after him.[1] [2]