Analysis of information sources in references of the Wikipedia article "Persecution of Christians in the Roman Empire" in English language version.
It appears to me that historians of ancient Rome generally accept Nero's persecution of Christians
Eus. HE 4.15.47, 5, PE, praef. 2, 5.4.3, 5.21.5, cf. V. Saxer, 'Les Actes des "Martyrs anciens" chez Eusèbe de Césarée et dans les martyrologes syriaque et hiéronymien' Analecta Bollandiana 102 (1984) 85-95