On the Trinity

Hilary’s major theological work was the twelve books now known as De Trinitate. Composed largely during his exile, though perhaps not completed until his return to Gaul in 360, the work was influenced by the homoiousion theology that Hilary had absorbed while in the East. Hilary also made use of the writings of Novatian and Tertullian, as well as numerous classical authors. Some scholars believe that books 2 and 3 of De Trinitate were originally written as an independent work and later fused with the rest by Hilary himself, but there is not universal agreement on this point.

David G. Hunter, “Fourth-Century Latin Writers: Hilary, Victorinus, Ambrosiaster, Ambrose,” in The Cambridge History of Early Christian Literature, ed. Frances Young, Lewis Ayres, and Andrew Louth (Cambridge: Cambridge University Press, 2004), 304.