Among the list of Roman emperors from the time of Jesus's birth until the book of revelation was written, which was the worst persecutor of Christians?

Among the list of Roman emperors from the time of Jesus’s birth until the book of revelation was written, Nero (r. 54–68) is often considered one of the worst persecutors of Christians. He is known for initiating a blanket persecution of Christians^1. However, it is important to note that there is some debate among historians about whether other emperors such as Domitian were also great persecutors of Christians^2.