Jesus is a verified factual historical figure who was executed more or less according to Biblical tradition.
https://en.wikipedia.org/wiki/Historical_Jesus
My understanding is that the Romans killed Jesus because they just wanted to avoid Jewish people rioting against Roman occupation. The Jewish priests framed Jesus so this would happen because he was speaking against specifically their religious power (He was not anti-rome).
I subscribe to the belief that some of Jesus' disciples faked his resurrection and started a cult.