When did the Catholic Church first prohibit bishops from remarrying?

We see the exhortation of St. Paul at 1 Timothy 3: 1-3: > The saying is sure: whoever aspires to the office of bishop desires a noble task. Now a bishop must be above reproach, **married only once**, temperate, sensible, respectable, hospitable, an apt teacher, not a drunkard, not violent but gentle, not quarrelsome, and not a lover of money. That implies that there was a custom of remarriage among the early Christians, which St. Paul would not allow in the case of selection of bishops. As for the modern Catholic Church, it has been prohibiting remarriage among all the believers. My question therefore is : at what point of time in its history did the Catholic Church start prohibiting remarriage among all believers?