234 THE REPUBLIC OF RAGUSA
same reason his son Vladislav left Ragusa and raised a rebellion against his father, allying himself with the Republic, to whom he promised to give back Canali as soon as he was master of the Duchy.1 In December 1451 Ragusa contracted an alliance with Stephen Thomas, who undertook “ to declare war without delay and carry it on without interruption against the Duke Stephen Vukcic (Kosaca), his government, his cities, and his servants, with all the glorious strength of Our kingdom, with Our servants, and Our friends in open warfare, as is suitable to Our lordship and Our kingdom, provided that no obstacle impede us and no Turkish army attack us.” 2 The Despot of Servia and other minor potentates joined the league against “ this perfidious heretic and Patarene.” 8 Ragusa also sent an envoy to Hungary to urge the King to intervene, stating that Kosaca was intriguing with the Venetians, the Turks, and the King of Aragon. It was suggested that this was a good moment for Hungarian action, as the Turks were in a state of anarchy in consequence of the death of the Sultan, and that a Hungarian army might now occupy Kodiviet and thus prevent them from ever entering Bosnia again.4 Hostilities commenced in 1452, and at first Kosaca was unlucky, for a number of his barons rose against him and joined Ragusa, and the commander of the league’s forces was his own son. But soon after a civil war broke out in Bosnia. The Herzegovinian nobles fought against the Duke while Kosaca was devastating Ragusan territory. At Ragusa’s instance a
          1 Miklosich, 444-47 ; Klaic, 385.
          3	Dipl. Rag., 274.
 2 Klaid, 386. 1 Ibid., 292.