The leader of these mercenaries, Jovan Nenad, established in 1526–27 his rule in Bačka, northern Banat and a small part of Syrmia and created an independent entity, with Subotica as its administrative centre. At the peak of his power, Jovan Nenad proclaimed himself as Serbian tsar in Subotica. He named Radoslav Čelnik as the general commander of his army, while his treasurer and palatine was Subota Vrlić, a Serbian noble from Jagodina. When Bálint Török returned and recaptured Subotica from the Serbs, Jovan Nenad moved the administrative centre to Szeged.