Ezra 10:44

David sought to build himself up politically by first marrying Saul’s daughter, then the widow of Nabal the rich Edomite, and then the daughter of Talmai, the king of Geshur. He took six wives from the women of Jebus, not to mention Bathsheba, the wife of the Hittite.

1. The ceremonial or legal wives.

3. Concubines, contractual wives.

The number of wives was only limited by the ability of the man to provide for them. Wealthy and able men wanted large numbers of children, and since the infant mortality was very high, it required an assembly of wives to recruit a large family. Many of these plural wives were mere laborers, slave wives.

4. Slave wives.

The institution of polygyny recognized, at various times, four sorts of wives:

The olden taboos on sex relations with a pregnant or nursing wife tended greatly to foster polygyny. Primitive women aged very early because of frequent childbearing coupled with hard work. (Such overburdened wives only managed to exist by virtue of the fact that they were put in isolation one week out of each month when they were not heavy with child.) Such a wife often grew tired of bearing children and would request her husband to take a second and younger wife, one able to help with both childbearing and the domestic work. The new wives were therefore usually hailed with delight by the older spouses; there existed nothing on the order of sex jealousy.

2. Wives of affection and permission.

The taboo wife — one wife of legal status — created the concubine mores. Under these mores a man might have only one wife, but he could maintain sex relations with any number of concubines. Concubinage was the steppingstone to monogamy, the first move away from frank polygyny. The concubines of the Jews, Romans, and Chinese were very frequently the handmaidens of the wife. Later on, as among the Jews, the legal wife was looked upon as the mother of all children born to the husband.

7. Certain religions required offspring.