The Alliance is usually associated with the later Quadruple and Quintuple Alliances, which included the United Kingdom and (from 1818) France with the aim of upholding the European peace settlement and balance of power in the Concert of Europe concluded at the Congress of Vienna. On 29 September 1818, Alexander, Emperor Francis I of Austria and King Frederick William III of Prussia met with the Duke of Wellington, Viscount Castlereagh and the Duc de Richelieu at the Congress of Aix-la-Chapelle to demand stern measures against university "demagogues", which would be realized in the Carlsbad Decrees of the following year. At the Congress of Troppau in 1820 and the succeeding Congress of Laibach in 1821, Metternich tried to align his allies in the suppression of the Carbonari revolt against King Ferdinand I of the Two Sicilies. In 1821 the Alliance met in Ljubljana. The Quintuple Alliance met for the last time at the Congress of Verona in 1822 to advise against the Greek Revolution and to resolve upon the French invasion of Spain.