Which Caesar ruled when John wrote Revelation?

Scholars have traditionally suggested two dates for the writing of the Revelation based on the repeated references to persecution. From about A.D 150, Christian authors usually referred to Domitian's reign (A.D. 81-96) as the time of John's writing, but there is no historical consensus supporting a persecution of Christians under Domitian while hard evidence does exist for a persecution under Nero (A.D. 54-68). In this century, most New Testament scholars have opted for the later date under Domitian (about A.D. 95), though there has been a resurgence of opinion arguing for a setting following the reign of Nero (about A.D. 68).