Holy Alliance

Holy Alliance, collective security agreement created at the Congress of Vienna in 1815 by Russia, Austria, and Prussia and later joined by most other European powers (excluding Britain, Turkey, and the Vatican). Its avowed aim was to promote mutual relations according to Christian principles. It had little importance in itself, except as a symbol of reaction; revolts in Spain and Naples in the 1820s were suppressed in its name.

See also: Vienna, Congress of.