Pope Pius V on the Trinity
One substance, three persons, co-equal and co-eternal
In the one Substance of the Divinity the Father is the First Person, who with His Only-begotten Son, and the Holy Ghost, is one God and one Lord, not in the singularity of one Person, but in the trinity of one Substance.
THE POSITION
One substance, three persons, in the creed's own vocabulary. Under Article I the Father is the first Person who with the Son and the Holy Ghost is "one God and one Lord"; the same section names the Father unbegotten, the Son begotten before all ages, and the Spirit proceeding from Father and Son from all eternity, and Article VIII is built around the Holy Ghost being equal to, and distinct from, the Father and the Son.
25 OTHERS HOLD THIS
ABOUT THIS FIGURE
Michele Ghislieri, a Dominican friar and inquisitor, was pope from 1566 to 1572 and carried the Council of Trent's decrees into practice. Under his authority came the Roman Catechism (1566), the reformed Breviary (1568) and Missal (1570), and the bull Ex omnibus afflictionibus (1567) on the teaching of Michael Baius; he also named Thomas Aquinas a Doctor of the Church. He wrote little theology of his own, so this entry rests on what he promulgated: the Roman Catechism, read in the McHugh and Callan translation, a commission's work issued by his order, and the 1567 bull in Deferrari's translation of Denzinger.
Cite this page
"Pope Pius V on the Trinity", Examined Doctrine, July 2026 edition, https://examineddoctrine.com/position/pius-v/trinity (archived at https://examineddoctrine.com/editions/2026-07/position/pius-v/trinity).