In June of 1389, Sultan Murad of the Ottomans leads his army against a coalition of Serbian and Bosnian lords under Prince Lazar on a plain in Kosovo. By nightfall both commanders are dead, killed in different ways and for different reasons, and Murad's son Bayezid has been acclaimed sultan on the same field where his father fell. Within hours, Bayezid has his own brother, Yakub Celebi, strangled to remove any rival claim to the throne, the opening act of a practice that would later become formal Ottoman succession law.
This episode follows what Bayezid built in the eleven years after that bloody afternoon. He earns the nickname Yildirim, the Thunderbolt, for the speed of his campaigns, and he uses it in three directions at once: he annihilates one of the largest crusading armies Western Europe ever raised at the Battle of Nicopolis in 1396, he blockades Constantinople for the better part of a decade while Byzantine emperor Manuel II tours European courts begging for help that never fully arrives, and he absorbs nearly every remaining independent Turkish principality in Anatolia, including the old and proud beylik of Karaman, into direct Ottoman rule.
That last conquest is the one that matters most for what comes next. The rulers Bayezid dispossessed do not simply disappear. They go east to the court of a conqueror named Timur, carrying grievances and local knowledge that will matter far more to Bayezid's future than anything that happened at Nicopolis or outside the walls of Constantinople. The same policy that made the House of Osman look wise for three generations is about to look very different on a different battlefield.
The episode draws on the earliest Ottoman chronicle tradition, Ahmedi, Asikpasazade, and Nesri, cross-checked against the Byzantine historian Chalkokondyles, the Arab chronicler al-Ayni, a Florentine Senate letter written weeks after Kosovo, and the eyewitness account of Johann Schiltberger, a Bavarian squire captured at Nicopolis, alongside modern scholarship from Halil Inalcik, Colin Imber, Dimitris Kastritsis, and Noel Malcolm.
Content Warning: this episode includes detailed descriptions of battlefield death, assassination, fratricide by strangulation, and the mass execution of prisoners of war.
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