"blindly subservient" to Charles of Anjou. Once again, Charles had no clear brake on his ambitions to conquer Constantinople, and he moved swiftly to prepare for this new offensive. One early move was taken by Pope Martin, who on 18 October 1281 excommunicated Michael without any warning or provocation, thus disrupting the union of Lyons. Charles had prepared a military force far larger than Michael could muster. According to Marino Sanudo, Charles had 100 ships in Sicily, and 300 more in Naples, Provence, and his Greek territories, which were to carry no fewer than 8,000 cavalrymen. Geanakoplos cites surviving documents that attest to the supplies Charles had accumulated. One Angevin rescript, dated 28 October 1281, lists a collection of tools to be gathered for the expedition, which includes "two thousand iron mattocks, three thousand iron stakes, sledges for smashing rocks, ropes, iron shovels, axes, and kettles for boiling pitch." Another orders the delivery of "four thousand iron stakes that are under construction in Venice." A third consists of instructions to a Pisan merchant for 2,500 shields of various sizes, all to be emblazoned with his royal emblem of lilies. Allied with Charles were a long list of powers. Besides having ties of kinship with the Kings of France and Hungary, the rulers of the Serbs and Bulgars were his allies, as well as the rulers of Epirus and dissidents of the Byzantine Empire, and the leading naval power of Europe, Venice. Obviously Michael sought allies against Charles of Anjou, but they were few. Donald Nicol lists the Mamluk Sultan of Egypt, who would "loan him ships", and the Tatars of the Golden Horde in South Russia who "could keep an eye on the Bulgarians". His ambassadors visited the court of Roman-German King Rudolph of Habsburg, but he was aloof. King Peter III of Aragon proved more welcoming, for he had his own reasons to hate Charles. According to Geanakoplos, Peter's wife Constance was the daughter of Manfred, and for this reason Peter considered Charles a usurper and Sicily the rightful property of Constance. Peter welcomed refugees from Sicily, most notably John of Procida, whom he made secretary of the royal chancery. Yet Aragon was at the other end of the Mediterranean, far from Michael. Before Charles of Anjou could start for Constantinople, however, the Sicilian Vespers rebellion struck, on 30 March 1282. Charles sent four ships to handle the revolt,