The Serbian leaders were killed and Serbian lands were grabbed by various independent nobles as well as the Ottomans. A decade later, Serbs defeated Ottomans in Battle of Pločnik in 1386. As the Battle of Kosovo in 1389 is generally considered as temporarily the end of the medieval Serbian state until 1402. Despotovina, the successor of the Serbian Empire and the state of Prince Lazar survived for 70 more years, experiencing a cultural and political renaissance in the first half of the 15th century before it was conquered by the Ottomans in 1459. Ragusan historian Mavro Orbin recorded that prince Lazar used cannons as early as 1373 in his war against Nikola Altamanovich in northern Serbia. The state was led by despot Stefan Lazarević and his successors from the Branković dynasty. Despot Stefan has armed his knights with light firearms (musket "Fitiljača"),also with spears, swords, daggers, maces, bow and arrows, crossbows, shields, armours, halberd and cannons. He also introduced Europe style knight tournaments. Even then, Serbian state continued to last in the Hungarian exile until the mid 16th century and the autonomous Serbian principality fell only in 1540.