second bulgarian empire - Background
The Byzantines ruled Bulgaria from 1018, when they conquered the First Bulgarian Empire, to 1185, although initially it was not fully integrated into the Byzantine Empire, for example preserving the existing tax levels and the power of the low-ranking nobility. The independent Bulgarian Orthodox Church was subordinated to the authority of the Ecumenical Patriarch in Constantinople, and the Bulgarian aristocracy and tsar's relatives were given various Byzantine titles and transferred to the Asian parts of the Empire. There were rebellions against Byzantine rule in 1040-41, the 1070s and the 1080s, but these failed.

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