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.
Muhammad
Little is known of Muhammad during his later youth, available information is fragmented, making it difficult to separate history from legend. It is known that he became a merchant and "was involved in trade between the Indian Ocean and the Mediterranean Sea." Due to his upright character he acquired the nickname "al-Amin" (Arabic: الامين), meaning "faithful, trustworthy" and "al-Sadiq" meaning "truthful" and was sought out as an impartial arbitrator. His reputation attracted a proposal in 595 from Khadijah, a 40-year-old widow. Muhammad consented to the marriage, which by all accounts was a happy one.