In the 4th chapter of Ruth, Boaz marries Ruth. Boaz was a rich man. In those days, a man could have more than one wife, i.e. Samuel's father, David,and Solomon. I think a man could have as many wives as he wanted and could afford. Since Boaz was a landowner with many servants and therefore wealthy, he probably had many wives. I think Boaz had other wives, but it was not necessary to mention them. Also, Boaz was acting as the kinsman redeemer. What do you think?