Jovan Nenad, known as the Black was a Serb military commander in the service of the Kingdom of Hungary who took advantage of a Hungarian military defeat at Mohács and subsequent struggle over the Hungarian throne to carve out his own state in the southern Pannonian Plain. He styled himself emperor (tsar).

Vojvodina, officially the Autonomous Province of Vojvodina, is an autonomous province that occupies the northernmost part of Serbia, located in Central Europe. It lies within the Pannonian Basin, bordered to the south by the national capital Belgrade and the Sava and Danube Rivers. The administrative centre, Novi Sad, is the second-largest city in Serbia.