Christians: What Biblical laws regulate multiple marriages?

In the old testament there were examples of men who married multiple women (usually the king). In the new testament there are no such examples. The only specific scriptures is several commands to deacons, overseers and elders to have only one wife and have a well mannered family. Jesus said "any man who divorces his wife and marries another women commits adultery and the man who marries a divorced women commits adultery." That page makes it clear that only one man and one women are married at a time. The reason I can think why in the other pages by the apostles it spells out rules for decans, elders and over seers is that there might have been men who already were married to multiple women (who were gentiles) when they converted. That was kind of a grandfather clause. God's people are supposed to either chooses a life of celebite service or married to one person of the opposite . I think this is pretty clear to me.