Scholars point out the dual origins of the power of the Muscovite prince, who functioned as both khan and basileus (the Byzantine emperor)—at once the secular and religious ruler of the realm. Often overlooked in this focus on dual origins is the continuing importance of the title of grand prince, which would remain central to the identity of Ivan III and his successors right up to the mid-sixteenth century. The title associated the princes of Moscow with the long-deceased rulers of Kyivan Rus’, allowing the princes to claim supremacy over the Rus’ lands—the former Kyivan possessions extending
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