What caused the church reforms of the mid-17th century?

In the middle of the 17th century, church reform was carried out with the aim of strengthening the church organization. Patriarch Nikon considered himself the Patriarch of the Ecumenical Church, which means that his power should be higher than the power of the tsar. As a result of the reforms carried out in the Church, a split occurred. Correcting books and making changes to the rite led to the fact that people were divided into Old Believers (supporters of the old way of life in the church) and supporters of the changes carried out by Nikon.

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