July and August saw three new revolutions. A rebellion at Nola on July 2 ended in King Ferdinand of the Two Sicilies taking the oath on the 13th to the Spanish constitution, then regarded as a model by the liberals of Southern Europe. But the grant of a constitution to Naples suggested a demand for independence at Palermo. On July 17-18 that city rose in revolt and was only subdued by the Neapolitans in the beginning of October. Portugal, too, was in a disturbed state. The royal family had been absent for nearly thirteen years, and the country had for five years been governed by Lord, afterwards Viscount, Beresford as marshal and commander of the Portuguese army. In April, 1820, he sailed for Brazil, intending to induce the king, John VI., to return. During his absence a revolution took place at Oporto on August 24, a provisional government was established, and all British officers were dismissed. This was followed by a similar revolution at Lisbon on September 15. Beresford on his return was forbidden to land, and retired to England. On November 11, the Spanish constitution was proclaimed in Portugal, but six days later another proclamation left the question of determining the constitution to the cortes which were to be elected on a popular suffrage. The Neapolitan revolution raised at once the question of intervention. In this case Castlereagh held that Austria had a right to interfere, because her position as an Italian power was endangered by the revolution, and because the revolution was a breach of the secret treaty of 1815 which had received the sanction of the British government. He still objected to any joint interference and was opposed to the reference of the question to a congress. Austria could not have interfered alone without offending the tsar, who clung to the principle of joint action. The question of intervention was therefore postponed for the present. France, however, being jealous of Austrian influence in Italy, demanded the meeting of a congress, and such a meeting was accordingly held at Troppau on October 20. To this congress Austria, France, Prussia, and Russia sent plenipotentiaries. Great Britain carried her opposition to joint interference so far as to refuse to join in the deliberations, though Sir Charles, now Lord, Stewart was sent to Troppau to watch the proceedings. Metternich, on finding that he could not avoid the meeting of a congress, determined to lead its proceedings, and, before it met, drew up a memorandum defining his own views about intervention. These views were accepted at the congress by Prussia and Russia as well as by Austria; and a protocol was issued by the three powers declaring that a state in which a revolution should occur was dangerous to other states, and ceased to be a member of the European alliance, until it could give guarantees for its future stability. If such a revolution placed other states in immediate danger, the allied