From Wikipedia:
Stefan Lazarević (Serbian Cyrillic: Стефан Лазаревић) (1374 – 19 July 1427) was a Serbian Despot, ruler of the Serbian Despotate beween 1389 and 1427. He was the son and heir to Prince Lazar, who died at the Battle of Kosovo against the Turks in 1389, and Princess Milica from the subordinate branch of the Nemanjić dynasty. His sister, Princess Olivera Despina, married the Ottoman Sultan Bayezid I, his brother-in-law, with whom he sided in a number of battles. Despot Stefan was a poet and a moderniser. His reign and his personal literary works are sometimes associated with early signs of the Renaissance in Serbian lands. He introduced knightly tournaments, modern battle tactics, and firearms to Serbia.
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