 There is also the Qolastā, or Canonical Book of Prayer and the Mandaean Book of John (Sidra ḏ'Yahia).After its decline in the Mediterranean world, Gnosticism lived on in the periphery of the Byzantine Empire, and resurfaced in the western world.The Paulicians, an Adoptionist group which flourished between 650 and 872 in Armenia and the Eastern Themes of the Byzantine Empire, were accused by orthodox medieval sources of being Gnostic and quasi Manichaean Christian.