To the west, Dušan scored victories over Hungarian leader Louis the Great that gave him eastern half of modern Bosnia, and his coins were minted at Kotor. Dušan was also successful against Louis' vassals: he defeated the armies of the Croatian ban and the forces of Hungarian voivodes. He was at peace with tsar Ivan Alexander Bulgaria, who even helped him on several occasions, and he is said to have visited Ivan Alexander at his capital. Serbia became temporarily dominant state between 1331 and 1365.