in Church History by Eusebius. The word martyr is not missing, you will find it 355 times. Martyrs from Pergamus are not missing, Carpus and Papylus, and a woman named Agathonice are mentioned as martyrs in Pergamus but not Antipas.  A commentary of the Apocalypse by Victorinus does not mention Antipas.  Could it be their copy of John’s Apocalypse did not mention Antipas?

Watch for more pieces that fit.  Blessed is the one who looks.