 Complete the following phrase:  On 15 December 1801, the popular Vizier of Belgrade Hadji Mustafa Pasha, a trusted ally of Selim III, was murdered by Kučuk Alija. Alija was one of the four leading Dahijas, Janissary commanders who were opposed to the Sultans reforms. This resulted in the Sanjak of Smederevo being ruled by these renegade janissaries independently from the Ottoman government. Several district chiefs were murdered in the 