Finnish Orthodox Church
In 1917, Finland became independent, and the Finnish Orthodox Church became autonomous under the Ecumenical Patriarchate of Constantinople; previously, it had been a part of the Russian Orthodox Church. Valaam was the most important monastery of the Finnish Orthodox Church. The liturgic language was changed from Church Slavonic to Finnish and the liturgic calendar from the Julian to the Gregorian calendar. These changes led to bitter decade-long disputes in the monastic community of Valaam.