1526–1532), known as Vojvoda Rajko (војвода Рајко), was a Serb general (vojvoda) in the army of Jovan Nenad, the titular Serbian Emperor who held present-day Vojvodina, who after the death of Jovan Nenad (1527) took part of the army from Bačka to Syrmia and acceded into Ottoman service.

[1][verification needed] He was one of the generals of Jovan Nenad, the titular Serbian Emperor who occupied a province of the former Kingdom of Hungary which had been conquered by the Ottomans in 1526, in present-day Vojvodina.

[4] He had taken part of the destroyed and dispersed army from Bačka to Syrmia,[citation needed] and acceded into Ottoman service.

[5] When the Ottoman army passed through Srem, Radoslav Čelnik crossed into Habsburg territory, and then returned when they had left.

[6] He is enumerated in Serbian epic poetry, in the song Margita devojka i vojvoda Rajko (Маргита девојка и војвода Рајко).