 Complete the following phrase:  Matthew Csák laid siege Buda in June 1311, and Ladislaus Kán declined to assist the king. Charles sent an army to invade Matthew Csáks domains in September, but it achieved nothing. In the same year, Ugrin Csák died, enabling Charles to take possession of the deceased lords domains, which were situated between Požega in Slavonia and Temesvár present-day Timișoara in Romania. The burghers of Kassa now Košice in Slovakia assassinated Amadeus Aba in September 1311. Charless envoys arbitrated an agreement between Abas sons and the town, which also prescribed that the Abas withdraw from two counties and allow the noblemen inhabiting their domains to freely join Charles. However, the Abas soon entered into an alliance with Matthew Csák against the king. The united forces of the Abas and Matthew Csák besieged Kassa, but Charles routed them in the 