Husein Gradaščević (Husein-kapetan), also known as Zmaj od Bosne, was an Ottoman Bosnian military commander who led an uprising against the Tanzimat, a system of political reforms with aim to modernise the Ottoman Empire. Born into a Bosnian noble family, Gradaščević became the captain of Gradačac in the early 1820s, succeeding his relatives in the position. He grew up surrounded by a political climate of turmoil in the western reaches of the Ottoman Empire. With the Russo-Turkish war (1828–29), Gradaščević's importance rose; the Bosnian governor gave him the task of mobilising an army between the Drina and Vrbas.