Tvrtko I of Bosnia
The distance between Bosnia and Ottoman Thrace proved no barrier, however. The hostility between King Tvrtko I of Bosnia and Đurađ II Balšić, ruler of Zeta (one of the Serbian statelets) and vassal of Murad, led to clashes between Bosnians and Turks earlier than would have been expected. The first Ottoman incursion into Bosnia, about which little is known, took place in October 1386. It was likely suggested and enabled by Đurađ, and caused panic in the neighbouring Republic of Ragusa. In 1388 Đurađ contacted the Ottoman commander Lala Şahin Pasha, then waging war in Epirus, hoping to slight Tvrtko.