In one source the great heresiarch Pelagius is stated to have been a Scot.
Father Cahier would even trace the book to Tatian, and it is true that that heresiarch mentions a writing of his own upon animals.
Bishop of Mesopotamia, and the Heresiarch Manes" ("Acta Disputationis Archelai Episcopi Mesopotamiae et Manetis Haeresiarchae," in Routh's Reliquiae Sacrae 2, v.
In 1125 the Church in the south of Russia had to combat another heresiarch named Dmitri.
HENRY OF LAUSANNE (variously known as of Bruys, of Cluny, of Toulouse, and as the Deacon), French heresiarch of the first half of the 12th century.
Soon afterwards the heresiarch was arrested, brought before the bishop of Toulouse, and probably imprisoned for life.
His first encounter was with the heresiarch Gottschalk, whose predestinarian doctrines claimed to be modelled on those of St Augustine.
At the council of Frankfort in 794 Alcuin upheld the orthodox doctrine, and obtained the condemnation of the heresiarch Felix of Urgel.
But four crusades, directed by the bishop of Vercelli, were required to reduce the little army of the heresiarch, entrenched in the mountains in the neighbourhood of Vercelli.