Gazi Husrev-beg (Ottoman Turkish: غازى خسرو بك, Gāzī Ḫusrev Beğ; Modern Turkish: Gazi Hüsrev Bey; 1480–1541) was an Ottoman Bosnian sanjak-bey (governor) of the Sanjak of Bosnia in 1521–1525, 1526–1534, and 1536–1541. He was known for his successful conquests and campaigns to further Ottoman expansion into Croatia and Hungary. However, his most important legacy was major contribution to the improvement of the structural development of Sarajevo and its urban area. He ordered and financed construction of many important buildings there, and with his will bequeathed all his wealth into endowment for the construction and long-term support of religious and educational facilities and institutions, such as the Gazi Husrev-beg Mosque, and the Gazi Husrev-begova Medresa complex with a Gazi Husrev-be