Vladislav Vlaicu of Wallachia, who had accepted his suzerainty. Tvrtko I of Bosnia also accepted Louis's suzerainty after Hungarian troops assisted him in regaining his throne in early 1367. Louis made attempts to convert his pagan or "schismatic" subjects to Catholicism, even by force. The conversion of the pagan Cumans who had settled in Hungary a century before was completed during his reign, according to John of Küküllő. After the conquest of Vidin, he sent Franciscan friars to the new banate to convert the local Orthodox population, which caused widespread discontent among the Bulgarians. In 1366, he ordered that all Serbian priests be converted and rebaptised. He also decreed that only Roman Catholic noblemen and knezes were allowed to hold landed property in the district of Sebes in Temes County. Louis supported the religious orders, especially the Franciscans and the Paulines, for whom he and his mother set up dozens of new monasteries. Upon Louis's request, Pope Urban V sanctioned the establishment of a university in Pécs in 1367, with the exception of a faculty of theology. However, Louis did not arrange for sufficient revenues and the university was closed by 1390. Vladislav Vlaicu of Wallachia made an alliance with Ivan Shishman, a half-brother of the former ruler of Vidin, Ivan Sratsimir. Their united armies imposed a blockade on Vidin. Louis marched to the Lower Danube and ordered Nicholas Lackfi, Voivode of Transylvania, to invade Wallachia in the autumn of 1368. The voivode's army marched through the valley of the Ialomița River, but the Wallachians ambushed it and killed many Hungarian soldiers, including the voivode. However, Louis's campaign against Wallachia from the west was successful and Vladislav Vlaicu yield to him in next summer. Upon his initiative, Louis restored Ivan Stratsimir in Vidin. Ivan Stratsimir swore loyalty to Louis and sent his two daughters as hostages to Hungary. From the late 1360s, Louis suffered from a skin disease with symptoms similar to leprosy. Thereafter he became even more zealous and dedicated more time to praying and religious contemplation. After his meeting with Louis in 1372, the papal legate, John de Cardailhac, stated: "I call God as my witness that I have never seen a monarch more majestic and more or one who desires peace and calm as much as he." He also changed the priorities of his foreign policy and began neglecting the Balkan states. Casimir III of Poland and