He accused the bishop of favouring the Christological heresies of the Monarchians, and, further, of subverting the discipline of the Church by his lax action in receiving back into the Church those guilty of gross offences.
The representatives of the extreme monotheistic view, which while regarding Christ as Redeemer, clung tenaciously to the numerical unity of the Deity, were called Monarchians, a term brought into general use by Tertuliian.
By monarchians of the former class Christ was held to be a mere man, miraculously conceived indeed, but constituted the Son of God simply by the infinitely high degree in which he had been filled with Divine wisdom and power.
After having done battle with heathens, Jews, Marcionites, Gnostics, Monarchians, and the Catholics, he died an old man, carrying with him to the grave the last remains of primitive Christianity in the West, but at the same time in conflict with himself.
Praxean (his principal work against the Monarchians), and Adv.
But, while excommunicating the strict Unitarians (Monarchians), he also took the same course with Hippolytus and his followers, declaring their teaching to be ditheism.