concubines
A concubine is a woman who lives with a man in a relationship resembling marriage but who is not legally or formally recognized as his wife. In many historical societies, concubinage was part of polygynous arrangements in which a man could keep one or more women beyond his wife or wives. The legal or social status of a concubine was generally subordinate to that of a wife, and her rights, duties, and the status of her children varied by time and culture.
Across civilizations, concubines served domestic, political, and economic functions. Rulers and elite households often used concubinage
In modern times, most legal systems have ended or restricted concubinage, treating such arrangements as private