 Louis summoned the Polish prelates and lords to Kassa (now Košice in Slovakia) in September 1379, persuading them to acknowledge Mary's right to succeed him in Poland.The contemporaneous Jan of Czarnków, who was biased against Louis, recorded that the Poles yielded to the monarch's demand only after he had prevented them from leaving the town by shutting its gates.At a meeting with Leopold III, Duke of Austria in early 1380, Louis strongly hinted that he would bequeath Hungary to his younger daughter, Jadwiga, who had been engaged to LeopoldIII's son, William.