MIGEZIO. — Spanish heretic of the late eighth century. He is little known, and only through documents hostile to him (letters from Elipandus to M. himself: PL 96, 859–67, and to the abbot Fidelis: ibid., 914–19; letter from the Spanish episcopate to the Frankish bishops: ibid., 1330), which present him as ignorant and visionary.
A resolute advocate of the customs and rights of the Roman Church, he lent his collaboration to Bishop Egila, whom the archbishop Vicarius of Sens had appointed as his delegate in Spain with the task of promoting the reform of that Church. But through his indiscreet zeal and heterodox doctrines, M. irritated the Elipandus (v.). Condemned by a Council convened at Seville (782) and also rejected by Pope Hadrian I (cf. Jaffé-Wattenbach 2479), M. disappeared while the nascent controversy over the adoptionism of Elipandus was attracting everyone’s attention.
In addition to accusations of an ethical and disciplinary nature (moral rigorism and differences in the calculation of Easter), Elipandus imputes to M. an extravagant Trinitarian doctrine: M. is said to have identified the Person of the Father with David, that of the Son with the man Jesus, and that of the Holy Spirit with the apostle Paul. Critics have sought to find in this reminiscences of Sabellianism, Priscillianism (v.), or even Muslim conceptions of prophecy. Today it is not excluded that a polemical procedure on Elipandus’s part considerably distorted M.’s conceptions, whose Christological formula, admissible by virtue of the “communication of idioms,” could not have pleased the father of Spanish adoptionism.