I want to know the answer to the following question:
As what was the event mistaken by some pagans?
All the background I'm provided with is that "Christian traveller and historian Sextus Julius Africanus and Christian theologian Origen refer to Greek historian Phlegon, who lived in the 2nd century AD, as having written "with regard to the eclipse in the time of Tiberius Caesar, in whose reign Jesus appears to have been crucified, and the great earthquakes which then took place"". Is that enough to answer the question?
Answer: no