(Jan. 26–May 12, 1821) Meeting of the Holy Alliance powers that set the conditions for Austrian intervention in and occupation of the Kingdom of the Two Sicilies in action against the Neapolitan revolution (1820).
The congress proclaimed its hostility to revolutionary regimes, agreed to abolish the Neapolitan constitution, and authorized the Austrian army to restore the absolutist monarchy. The British and French protested the decision.