The Martyrs of Lyons
“And when a dissension arose about these said people [the Montanists], the brethren in Gaul once more . . . [sent letters] to the brethren in Asia and Phrygia and, moreover to Eleutherius, who was then [A.D. 175] bishop of the Romans, negotiating for the peace of the churches” (Eusebius, Church History 5:3:4 [A.D. 312])
“And the same martyrs too commended Irenaeus, already at that time [A.D. 175] a presbyter of the community of Lyons, to the said bishop of Rome, rendering abundant testimony to the man, as the following expressions show: ‘Once more and always we pray that you may rejoice in God, Pope Eleutherius. This letter we have charged our brother and companion Irenaeus to convey to you, and we beg you to receive him as zealous for the covenant of Christ’” (ibid., 5:4:1–2).