Heretics, in fact, were more numerous than ever in Lombardy, for the active work carried on in Languedoc by Bernard de Caux and his colleagues had caused a wholesale emigration. Until the death of Frederic, Lombardy was regarded as a secure haven; colonies established themselves there, and even after the Lombard Inquisition was thoroughly organized the persecuted wretches continued for half a century to seek refuge there, nor do we often hear of their being detected.[242] All of Rainerio’s resolution and energy were required for the work before him. In the March of Treviso, Ezzelin da Romano, whose influence extended far to the west, continued openly to protect heresy, and even in Lombardy the hopes excited by Frederic’s death threatened to prove fallacious. In 1253, when Conrad IV. passed through Treviso to recover possession of his Sicilian kingdom, he appointed as his Lombard vicar-general Uberto Pallavicino, who soon became as obnoxious to the Church as Ezzelin himself; and, though Conrad died in 1254, and Innocent IV. seized Naples as a forfeited fief of the Church, Pallavicino’s power continued to increase, and he soon established relations with Manfred, Frederic’s illegitimate son, who wrested Naples from the papacy and became the chief of the Ghibelline faction. Even more threatening was the revulsion of feeling in Milan itself, when its ardent Guelfism was changed to indifference by Innocent’s indiscreet assertion of certain ecclesiastical immunities which touched the pride of the citizens. The heads of the hydra might well seem indestructible. One of Rainerio’s first enterprises, in 1253, was summoning Egidio, Count of Cortenuova, before his tribunal, as a fautor and defender of heresy. The castle of Cortenuova, near Bergamo, had been razed as a nest of heretics, and its reconstruction prohibited, but the count had seized the castle of Mongano, which was claimed by the Bishop of Cremona, and had converted it into a den of heretics, who enjoyed immunity under his protection. He disdained to obey the citation and was duly excommunicated. He paid no attention to this, and on March 23, 1254, Innocent IV. ordered the authorities of Milan, under pain of ecclesiastical censures, to take the castle by force and deliver its inmates to the inquisitors for trial. The count, however, was in close alliance with Pallavicino, “that enemy of God and the Church,” and the Milanese appear to have had no appetite for the enterprise at the time. Mongano continued to be a place of refuge for the persecuted until 1269, when the Milanese were at last stimulated to undertake the siege, and on capturing it handed it over to the Dominicans.[243]