Tvrtko I of Bosnia
The earliest sources on the Battle of Kosovo, which generally favour the cult of Prince Lazar, do not mention Miloš or his assassination of the sultan. The assassination itself is first recorded by Deacon Ignjatije on 9 July 1389, only 12 days after the battle. The assassination of sultan Murad and one of his sons was also mentioned in the instructions of the Venetian Senate issued to Andrea Bembo on 23 July 1389, although Venetians were uncertain if news about the assassination were true. On 1 August 1389 King Tvrtko I of Bosnia (r. 1353-1391) wrote a letter to Trogir to inform its citizens about Ottoman defeat. Victory over the Turks () was also reported by Coluccio Salutati (died 1406), Chancellor of Florence, in his letter to King Tvrtko, dated 20 October 1389, on behalf of the Florentine Senate. The killer is not named but he is described as one of twelve Christian noblemen who managed to break through the Ottoman ranks: