Throughout the history of early and imperial Russia there were, however, religious movements which posed a challenge to the monopoly of the Russian Orthodox Church and put forward stances of freedom of conscience, namely the Old Believers—who separated from the Russian Orthodox Church after Patriarch Nikon's reform in 1653 (the "Raskol")—, and Spiritual Christianity (or Molokanism). It is worth noting that the Russian Orthodox Church itself never forbade personal religious experience and speculative mysticism, and Gnostic elements had become embedded in Orthodox Christianity since the sixth century, and later strengthened by the popularity of Jakob Böhme's thought in sixteenth- and seventeenth-century Orthodox seminaries.