The commentary itself was written during the papacy of Pope Damasus I, that is, between 366 and 384, and is considered an important document of the Latin text of Paul before the Vulgate of Jerome, and of the interpretation of Paul prior to Augustine of Hippo.
The two were elected simultaneously (Damasus' election was held in San Lorenzo in Lucina) in an atmosphere of rioting.
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However, they sent three --Syriacus, Eusebius and Priscian—with a synodal letter to Pope Damasus I, archbishop Saint Ambrose and the other bishops assembled in the council at Rome.