 Władysław took advantage of the situation perfectly, mastering the duchies of Sandomierz, Sieradz-Łęczyca, and Brześć Kujawski by the end of the year.The declining Czech government tried to support Wenceslaus III by organizing an expedition against Władysław.Again luck favored Władysław, as on 4 August 1306, Wenceslaus III was treacherously murdered in Olomouc in Moravia, and the Kingdom of Bohemia was without a monarch and in the heat of a civil war.