St. Irenaeus was a second century theologian.
Isidore of Seville
Isidore of Seville (c. 560 – April 4, 636) was archbishop of Seville and a medieval scholar
Catholic Encyclopedia: MONTANISTS
The essential principle of Montanism was that the Paraclete, the Spirit of truth, was manifesting himself to the world through Montanus and Maximilla.
Explains the selection process of the books regarded now as sacred. Montanus sought to increase the corpus with his own supposedly divinely inspired revelations.
Montanism, a second century heresy from Phrygia, was also known as the Cataphrygian Heresy and the New Prophecy. The chief source on it are Eusebius and Tertullian. The utterances of the Montanist prophets were recorded.
Montanism: Heresy Or Healthy Revival?
History of the movement from its beginnings -- partly in response to the bishops' increased power, through its two female leaders and finally its greatest convert, Tertullian, before its final obliteration in the fifth century.