Keep in mind there was a provision for divorcing a wife that a man had married when he was a pagan if she left him when he converted. (Actually, that option still exists.) Paul may have intended to exclude such men.
There is also considerable evidence that the ancients were not impressed with a man who was widowed and remarried in mature years. It was viewed as a sign of not being able to control one's appetites.
The "husband of one wife" clause had nothing to do with polygamy, which was equally unknown among Greco-Roman pagans, Jews, and Christians in Paul's day.
The “husband of one wife” clause had nothing to do with polygamy, which was equally unknown among Greco-Roman pagans, Jews, and Christians in Paul’s day.
Have the historians even found Christ`s name any place?
I don`t know but seems to me they have a big problem of even getting him in history, or for that matter even the early Church.