Tvrtko I of Bosnia
Tvrtko I of Bosnia had himself crowned king, adopting the title of "King of Serbia, Bosnia and the Coastland", in 1377. Whether Louis had approved Tvrtko's coronation cannot be decided. A new war broke out between Venice and Genoa in 1378. Louis supported the Genoese and Trogir became the regular base of the Genoese fleet, which transformed Dalmatia into an important theater of war. Louis also sent reinforcements to Francesco I da Carrara to fight against the Venetians.