Tvrtko I of Bosnia
Garai launched, in 1369, a punitive expedition against Vladislav I of Wallachia who had rebelled against King Louis I and defeated a royal army led by Nicholas Lackfi, "voivode" of Transylvania. The 17th-century historian, Mavro Orbin relates that Garai supported Lazar Hrebeljanović of Serbia and Tvrtko I of Bosnia against their opponents, Nikola Altomanović. Around the same time, he arranged a marriage between his namesake son and a daughter of Lazar Hrebeljanović. Garai participated in the first Hungarian expedition against the Ottomans in 1375.