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ton Ros,as well as tsar. The title of tsar was used to denote a fullness of a sovereign's power and was reserved to the Holy Roman emperor and the Byzantine emperor, and later the khan of the Golden Horde. In literature, it was also used in a wider sense to indicate an illustrious ruler. Unlike its usage in Bulgarian and Serbian, where the title of tsar was used to challenge the power of the basileus,

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