Note 243 — Chapter XXI · THE FOREIGN CULTS: CYBELE, ISIS, MITHRAS. THE CHRISTIANS IN PAGAN EYES
Reading edition
Mithras worship was only beginning to be important in the Age of Hadrian, and the Taurobolium was then still comparatively rare; by 200 A.D. it had become decidedly common; by 300 A.D. it was very frequent indeed.