Eusebius in his Church History mentions Pergamus twice but never mentions Antipas. He mentions martyr 355 times. He mentions Carpus, Papylus, and Agathonice as martyrs of Pergamus. He mentions six of the churches of the Apocalypse but never associates them with the Apocalypse. There is only one explanation for this.  His copy or version of the Apocalypse did not include them.