Romagna and the Marche was held by local "vicars", who were in fact petty hereditary lords. In particular, Martin confirmed Giorgio Ordelaffi in Forlì, Ludovico Alidosi in Imola, Malatesta IV Malatesta in Rimini, and Guidantonio da Montefeltro in Spoleto, who would later marry the pope's niece Caterina Colonna. In exchange for the recognition of Joan II of Naples, Martin obtained the restitution of Benevento, several fiefs in the Kingdom of Naples for his relatives and, most important of all, an agreement that Muzio Attendolo, then hired by the Neapolitans, should leave Rome. After a long stay in Florence while these matters were arranged, Martin was able to enter Rome in September 1420. He at once set to work establishing order and restoring the dilapidated churches, palaces, bridges, and other public structures. For this reconstruction he engaged some famous masters of the Tuscan school and helped instigate the Roman Renaissance. Faced with competing plans for general reform offered by various nations, Martin V submitted a counter-scheme and entered into negotiations for separate concordats, for the most part vague and illusory, with the Holy Roman Empire, England, France and Spain. Hussite Wars By 1415 Bohemia was in turmoil and the subject of much discussion at the Council of Constance. Adherents of Jan Hus, who had been previously burned at the stake as a heretic by the Council, adopted the practice of Communion under both kinds. The Council sent letters to the civil and ecclesiastical authorities in Bohemia, insisting they deal with the heresy. Bohemian and Moravian nobles responded that the sentence on Hus was unjust and insulting to their country, and promised to protect priests against episcopal prosecutions for heresy. Prague was placed under interdict for sheltering the excommunicated Jan of Jesenice. Beghards arrived attracted by Bohemia's reputation for religious liberty. In 1419 King Wenceslaus IV, who had resisted what he considered interference in his kingdom, commanded that all ejected Catholic beneficiaries should be reinstated in their offices and revenues. Prague prepared for armed resistance. Jan Želivský, an extreme anti-Catholic preacher of Prague, led a procession to the town hall, where under the leadership of Jan Žižka of Trocnov, a noble of southern Bohemia, the building was stormed and people found inside were thrown out of the windows on to the spears and swords of the processionists, and hacked to pieces. In Kuttenberg, hundreds of captured Hussites were thrown by the miners