The reason why Clement of Rome mentions these two special apostles (other apostles had already suffered martyrdom) is obvious. Clement was referring to examples of which they themselves had been eye-witnesses. Paul, it is universally acknowledged, was martyred in Rome; is not the inference from the words of Clement, that Peter suffered martyrdom in this same city also, overwhelming? _Ignatius_, _circa_ A.D. 108-9, some twelve or thirteen years after Clement had written his _Epistle to the Corinthians_, on his journey to his martyrdom at Rome, thus writes to the Roman Church: “I do not command you like Peter and Paul: they were apostles; I am a condemned criminal.” Why now did Ignatius single out Peter and Paul? So Bishop Lightfoot, commenting on this passage, forcibly says: “Ignatius was writing from Asia Minor. He was a guest of a disciple of John at the time. He was sojourning in a country where John was the one prominent name. The only conceivable reason why he specially named Peter and Paul was that these two apostles had both visited Rome and were remembered by the Roman Church.” _Papias_ of Hierapolis, born _circa_ A.D. 60-70. His writings probably date somewhat late in the first quarter of the second century. On the authority of Presbyter John, a personal disciple of the Lord, Papias tells us about Mark: he was a friend and interpreter of S. Peter, and wrote down what he heard his master teach, and there (in Rome) composed his “record.” This notice seems to have been connected by Papias with 1 Pet. v. 13, where Mark is alluded to in connexion with the fellow-elect in Babylon (Rome). “It seems,” concludes Bishop Lightfoot, referring to Irenæus (_S. Clement of Rome_, ii. 494), “a tolerably safe inference, therefore, that Papias represented S. Peter as being in Rome, that he stated Mark to have been with him there, and that he assigned to the latter a Gospel record (the second Gospel) which was committed to writing for the instruction of the Romans.” _Dionysius_ of Corinth, A.D. 170, quoted by Eusebius (_H. E._ II. xxv.), wrote to Soter, bishop of Rome, as follows: “Herein by such instructions (to us) ye have united the trees of the Romans and Corinthians (trees) planted by Peter and Paul. For they both alike came also to our Corinth, and taught us; and both alike came together to Italy, and having taught there, suffered martyrdom at the same time.” _Irenæus_, _circa_ A.D. 177-90, writes: “Matthew published also a written Gospel among the Hebrews in their own language, while Peter and Paul were preaching and founding the Church in Rome. Again after their departure, Mark, the disciple and interpreter of Peter, himself also handed down to us in writing the lessons preached by Peter.”--_H. E._ III. i. 1.