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During the Battle of Adrianople, the Bulgarian emperor Krum led his army south towards Adrianople and pitched camp near Versinikia. Michael I, the Byzantine emperor, lined up his army against the Bulgarians, but neither side initiated an attack for two weeks. Finally, on June 22, 813, the Byzantines attacked but were immediately turned to flight. With Krum's cavalry in pursuit, the rout of Michael I was complete and Krum advanced on Constantinople, which he besieged by land.