sentences:  He allied himself with Lazar against King Vukašin Mrnjavčević and they managed to persuade Uroš to support them.However, after Lazar pulled out at the critical moment they were defeated at Kosovo in 1369.In 1373, a military alliance against Nikola was created, which included Bosnian Ban Tvrtko I Kotromanić, Zetan Ruler Đurađ I Balšić, Mačvan Prince Nikola Gorjanski, and Hungarian King Ludovik I.