Old Believers
Patriarch Nikon (1605-1681; 1651-1658 as patriarch) wanted to bring the Russian Orthodox Church and the Greek Orthodox Church closer together. For this reason, he changed a few rituals and texts in 1651. These changes were made to the Russian rituals to be closer to the Greek ones of Nikon's time. According to the Old Believers, Nikon did this without the support of the clergy. and without a council. When the changes were done, people who still practised the old rites were persecuted.