2 Chronicles 11:20-21

11:20 He later married Maacah the daughter of Absalom. She bore to him Abijah, Attai, Ziza, and Shelomith. 11:21 Rehoboam loved Maacah daughter of Absalom more than his other wives and concubines. ¹  He had eighteen wives and sixty concubines; he fathered twenty-eight sons and sixty daughters.

[11:21]  ¹ sn Concubines were slave women in ancient Near Eastern societies who were the legal property of their master, but who could have legitimate sexual relations with their master. A concubine’s status was more elevated than a mere servant, but she was not free and did not have the legal rights of a free wife. The children of a concubine could, in some instances, become equal heirs with the children of the free wife. After the period of the Judges concubines may have become more of a royal prerogative (2 Sam 21:10-14; 1 Kgs 11:3).