Abstract
The decades of the second half of the 8th century are one of the darkest periods in our medieval history, both because of the proverbial lack of information and because of the ambiguity and contradictions in the little sources which are available. Despite the multiple attempts of researchers to overcome these ambiguities, it seems that this period of the history of the Bulgarian state, full of historical figures and events, will remain a great mystery for historians. The aim of the present work is, by systematizing most of these attempts in Bulgarian and foreign historiography from the beginning till present days, to reveal the leading hypotheses about the genesis and essence of the political crisis in early medieval Bulgaria, as well as to highlight the main problems that preoccupy researchers of this period.
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