ENThe article examines the Synevodskaya battle from the point of view of source study. The facts are summarized, on the basis of which you can recreate the picture of political life in Podolia, Kiev and on Bryansk land in the third quarter of the XIV century. Keywords: Blue Waters, White Coast (Beloberezhye), Lithuania, Bryansk principality, annals, Horde, Podolia. [From the publication]