Unicus and Unigenitus in the Latin Bible

The Nicene Question in the Translation of monogenes

Abstract

The Latin rendering of Greek monogenes has become a test case in debates about doctrinal influence on biblical translation. While many modern versions prefer “only” or “unique,” the Vulgate normally uses unigenitus in the Johannine passages concerning Christ, a choice sometimes explained as an anti-Arian intervention inspired by Nicaea. This article tests that explanation against the lexical range of monogenes, the Old Latin evidence, pre-Nicene usage, and the distribution of unicus and unigenitus in the Latin Bible. The evidence does not support a simple account in which Jerome replaced a neutral unicus with a doctrinally charged innovation. Old Latin witnesses already display both renderings, and Tertullian uses both unicus and unigenitus in Johannine contexts more than a century before Nicaea. Moreover, the Vulgate employs unigenitus for human beings who are only children and does not translate every occurrence of monogenes by that term. The Nicene Creed could reinforce the association of unigenitus with begetting, but it neither created the word nor adequately explains its biblical distribution.