The revolutions that took place in Spain, Naples, and Portugal in 1820 presented an occasion for another meeting of the allies. In November the representatives of Austria, Russia, and Prussia met in conference at Troppau, and issued a circular setting forth what they had already done for Europe in overthrowing the military tyranny of Napoleon and expressing the determination "to put a curb on a force no less tyrannical and no less detestable, that of revolt and crime." The conference then adjourned to Laybach, where they could, with greater dispatch, order the movements they had decided to take against the revolutionists of Naples. Austria, being more intimately concerned with the political condition of the Italian peninsula than either of the other two powers, was entrusted with the task of suppressing the Neapolitan revolution. The Austrian army entered Naples March 23, 1821, overthrew the constitutional government that had been inaugurated, and restored Ferdinand II to absolute power. The revolution which had broken out in Piedmont was also suppressed by a detachment of the Austrian army. England held aloof from all participation in the proceedings at Troppau and Laybach--though Sir Charles Stuart was present to watch the proceedings. In a circular dispatch of January 21, 1821, the British government expressed its dissent from the principles set forth in the Troppau circular. The next meeting of the allied powers was arranged for October, 1822, at Verona. Here the affairs of Greece, Italy, and, in particular, Spain came up for consideration. At this Congress all five powers of the alliance were represented. France was uneasy about the condition of Spain, and England had to send a delegate out of self-defense, as her interests were largely involved. Castlereagh was preparing to depart for the congress, when his mind gave way under the stress of work and more remotely of dissipation, and he committed suicide. Canning then became secretary for foreign affairs, and Wellington was sent to Verona.