The initial successes of Peter's reign were followed by several minor setbacks. Around 930, Peter faced a revolt led by his younger brother Ivan, who was defeated and sent into exile in Byzantium. Perhaps taking advantage of these challenges to Peter's rule, the Prince of Serbia Časlav Klonimirović escaped the Bulgarian capital Preslav in 933 and, with tacit Byzantine support, managed to raise a Serbian revolt against Bulgarian rule. The revolt succeeded and Serbia recovered its independence from Bulgarian Empire.