My 43rd great grandmother, and wife of Clovis I, King of the Franks. Chlotilde was a Christian, but she married Clovis who was a very vigorous pagan. The Salian Franks were primarily pagan at this time, but a few were being baptized as Aryan Christians by Bishop Ulfilas. The pagan belief system was based upon sacred oak trees, rituals, a pantheon of various gods, later writers would give them the names of the Roman gods, but they were uniquely German. One of the major aspects was that they practiced polygamy. I suspect that one of the conditions of marriage was that Clovis would not have multiple wives.
The important issue was that the almost all of the Christian leadership in Europe was Aryan, and when Clovis was baptized he followed the Nicaean Creed, which was Catholic, and followed the Pope in Rome. This meant that Clovis’ descendants would also be what became as traditional Catholics, and led to the Pope to eventually declaring Charlemagne as the Holy Roman Emporer. This was a bit irritating to the Eastern Orthodox Church because they technically already had a Holy Roman Emporer it was contentious for a thousand years. The Aryan Christians were eventually declared heretical and disappeared.
Chlotilde was a remarkable woman, and did not give up on her desire to have her husband come to faith. By her action the future of Europe changed, the future of the Church changed. Sometimes it comes to one individual.