Louis signed a treaty with Emperor Charles and Rudolf IV of Austria in Brno in early 1364, which put an end to their conflicts. In September, Louis visited Cracow to attend the large congress where Peter I of Cyprus attempted to persuade a dozen European monarchs to join the crusade. Louis was the only monarch to promise assistance, but later failed to fulfill his promise. At the congress, Casimir III of Poland confirmed Louis's right to succeed him in Poland if he died without a male issue. Louis, who had not fathered a son either, invited a distant relative of his, Charles of Durazzo, to Hungary in 1364, but did not make the young prince his official heir. Louis allowed the Jews to return to Hungary in the same year; legal proceedings between the Jews and those who had seized their houses lasted for years.