"In the context of Russian Orthodox church history, the Old Believers, or Old Ritualists (Russian: \u0441\u0442\u0430\u0440\u043E\u0432\u0435\u0301\u0440\u044B or \u0441\u0442\u0430\u0440\u043E\u043E\u0431\u0440\u044F\u0301\u0434\u0446\u044B, starovyery or staroobryadtsy) separated after 1666 from the official Russian Orthodox Church as a protest against church reforms introduced by Patriarch Nikon of Moscow between 1652 and 1666."@en . . .