Opponents of the ecclesiastical reforms of Nikon emerged among all strata of the people and in relatively large numbers. Even after the deposition of patriarch Nikon (1658), who presented too strong a challenge to the Tsar's authority, a series of church councils officially endorsed Nikon's liturgical reforms. The Old Believers fiercely rejected all innovations, and the most radical amongst them maintained that the official Church had fallen into the hands of the Antichrist. Under the guidance of Archpriest Avvakum Petrov (1620 or 1621 to 1682), who had become the leader of the conservative camp within the Old Believers' movement, the Old Believers publicly denounced and rejected all ecclesiastical reforms. The State church anathematized both the old rites and books and those who wished to stay loyal to them at the synod of 1666. From that moment, the Old Believers officially lacked all civil rights. The State church had the most active Old Believers arrested, and executed several of them (including Archpriest Avvakum) some years later in 1682.