In addition to the conflict in Serbia, the year 1409 had several significant events that influenced the change of situation in the Balkans. Süleymanmade peace with the Venetians in June, to whom they pledged to pay an annual tribute, as well as surrendering their former possessions in the area of Skadar and Zeta. His brother and rival in the struggle for power, Musa Çelebi moved to Europe and began to gather around him supporters and allies in the fight against Süleyman.