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.
Criticism of Muhammad
According to the English translation of the book, "The Wives of the Messenger of Allah" by Muhammad Swaleh Awadh, it states that she was married to Muhammad in Dhul Qa'adah, in the fifth year of Hijra. Since Zaynab was the wife of Muhammad's adopted son, pre-Islamic practices frowned upon such her marriage with the prophet. Arab society would have viewed this union as profoundly wrong; because they considered an adopted son was truly a "son", for a man to marry his adopted son's wife—even if she was divorced—was considered wrong.