Both armies were broken by the battle. Both Lazar and Murad lost their lives, and the remnants of their armies retreated from the battlefield. Murad's son Bayezid strangled his younger brother, Yakub Çelebi, upon hearing of their father's death, thus becoming the sole heir to the Ottoman throne. The Serbs were left with too few men to defend their lands effectively, while the Turks had many more troops in the east. Consequently, the Serbian principalities that were not already Ottoman vassals became so in the following years, yielding one by one. Furthermore, in response to Ottoman pressure, several Serbian noblemen wed their daughters, including the daughter of Prince Lazar, to Bayezid. In the wake of these marriages, Stefan Lazarević became a loyal ally of Bayezid, going on to contribute significant forces to many of Bayezid's future military engagements, including the Battle of Nicopolis. Eventually the Serbian Despotate would, on numerous occasions, attempt to defeat the Ottomans in conjunction with the Hungarians until its final defeat in 1459.