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.
Ali
Their marriage lasted until Fatimah's death ten years later and was said to be full of love and friendliness. Ali is reported to have said about Fatimah, "By Allah, I did never anger her or force her to do something (unwillingly) until Allah took her to the better world. She also did never anger me nor did she disobey me in anything at all. When I looked at her, my griefs and sorrows were relieved." Although polygamy was permitted, Ali did not marry another woman while Fatimah was alive, and his marriage to her possesses a special spiritual significance for all Muslims because it is seen as the marriage between two great figures surrounding Muhammad. After Fatimah's death, Ali married other women and fathered many children.