Muhammad's wives
Muhammad was monogamous for 25 years. After his first wife Khadija bint Khuwaylid died, he proceeded to marry the wives listed below, and most of them were widows. Muhammad's life is traditionally delineated as two epochs: pre-hijra (emigration) in Mecca, a city in western Arabia, from the year 570 to 622, and post-hijra in Medina, from 622 until his death in 632. All but two of his marriages were contracted after the Hijra (migration to Medina). Of Muhammad's thirteen wives, at least two, Rayhana bint Zayd and Maria al-Qibtiyya, were referred to simply as concubines; however, there is debate among Muslims as to whether these two officially became his wives. Of his thirteen wives, only two bore him children, a fact which has been described as "curious" by Cornell University Professor of Near Eastern Studies David S. Powers.
Women in Islam
During his life, Muhammad married nine or eleven women depending upon the differing accounts of who were his wives. In Arabian culture, marriage was generally contracted in accordance with the larger needs of the tribe and was based on the need to form alliances within the tribe and with other tribes. Virginity at the time of marriage was emphasised as a tribal honour. William Montgomery Watt states that all of Muhammad's marriages had the political aspect of strengthening friendly relationships and were based on the Arabian custom.