Holy Alliance
noun
a league formed by the principal sovereigns of Europe in 1815 with the professed object of promoting Christian brotherhood but the practical object of repressing democratic revolutions and institutions. The English and Turkish rulers and Pope Pius VII did not join the league.
British Dictionary definitions for holy alliance
Holy Alliance
noun
a document advocating government according to Christian principles that was signed in 1815 by the rulers of Russia, Prussia, and Austria
the informal alliance that resulted from this agreement