Ivan Shishman

Although Ivan Shishman, Bulgaria’s last medieval tsar, declared himself a vassal of Murad in 1371, the Ottomans continued to seek complete domination. Sofia, in the west, was seized in 1382, and Shumen, in the east, fell in 1388. A year later the defeat of the Serbs…

…came when the Bulgarian tsar Ivan Shishman broke with the alliance of Slavic powers and accepted Ottoman suzerainty. No longer threatened from the east, the armies of Sultan Murad I were able to concentrate their weight against Serb resistance. Led by the Serb knez, or prince, Lazar Hrebeljanović (he did…