As though to confirm the victory, Arialdo, in 1066, at a council held in Rome, procured the excommunication of his archbishop, Guido, with which he returned triumphantly to Milan. Some popular revolution among the factions, however, had brought Guido back to the city, where he maintained a precarious position. Disregarding the excommunication, he resolved to officiate in the solemn services of Pentecost (June 4th, 1066), and, braving all opposition, he appeared at the altar. Excited to fury at this unexpected contumacy, the popular party, led on by Erlembaldo and Arialdo, attacked him in the church; his followers rallied in his defence, but, after a stubborn fight, were forced to leave him in the hands of his enemies, by whom he was beaten nearly to death. Shocked by this outrage, many of the citizens abandoned the party of the reformers, and the nobles, taking advantage of the revulsion of feeling, again had the ascendency. Arialdo was obliged to fly for his life, and endeavored to conceal himself, travelling only by night. The avengers were close upon his track, however; he was betrayed by a priest, and the satellites of Guido carried him to an island in Lago Maggiore, where (June 27th, 1066) they put him to death, with all the refinement of cruelty. A series of miracles prevented the attempted concealment of the martyred corpse, and ten months later Erlembaldo recovered it, fresh and untouched by corruption. Carried to Milan, it was interred with stately pomp in the monastery of San Celso, where the miracles wrought at his tomb proclaimed the sanctity of him who had died for the faith, and ere long his canonization formally enrolled St. Arialdo among the saints of Heaven.[518]