In the late 2nd century AD, a Christian convert from Phrygia (modern Turkey) named Montanus began experiencing visions and speaking in tongues, which he believed were the Holy Spirit speaking through him. Soon he was joined by two women, Priscilla and Maximilla, who experienced the same ecstatic episodes. Montanus and his followers believed he was a prophet, called to lead Christians back to their primitive purity. In this episode of Controversies in Church History, we take a look at the history of Montanism, as its followers were called, and how it parallels other heretical movements in the history of the Church.