A loose alliance of European powers pledged to uphold the principles of the Christian religion. It was proclaimed at the Congress of Vienna (1814–15) by the emperors of Austria and Russia and the king of Prussia and was joined by most other European monarchs.
Definition of Holy Alliance in US English:
Holy Alliance
proper noun
A loose alliance of European powers pledged to uphold the principles of the Christian religion. It was proclaimed at the Congress of Vienna (1814–15) by the emperors of Austria and Russia and the king of Prussia and was joined by most other European monarchs.