According to the nearly contemporaneous chronicle of John of Küküllő, Louis launched his first campaign against a group of Transylvanian Saxons, who had refused to pay taxes, and forced them to yield in the summer of 1344. During his stay in Transylvania, Nicholas Alexanderwho was the son of Basarab, the ruling prince of Wallachiaswore loyalty to Louis on his father's behalf in Brassó (now Brașov in Romania); thus the suzerainty of the Hungarian monarchs over Wallachia was, at least outwardly, restored.