Muhammad
Muhammad's life is traditionally defined into two periods: pre-hijra (emigration) in Mecca (from 570 to 622), and post-hijra in Medina (from 622 until 632). Muhammad is said to have had thirteen wives in total (although two have ambiguous accounts, Rayhana bint Zayd and Maria al-Qibtiyya, as wife or concubine.) Eleven of the thirteen marriages occurred after the migration to Medina.
Muhammad
At the age of 25, Muhammad married the wealthy Khadijah bint Khuwaylid who was 40 years old. The marriage lasted for 25 years and was a happy one. Muhammad did not enter into marriage with another woman during this marriage. After Khadijah's death, Khawla bint Hakim suggested to Muhammad that he should marry Sawda bint Zama, a Muslim widow, or Aisha, daughter of Um Ruman and Abu Bakr of Mecca. Muhammad is said to have asked for arrangements to marry both. Muhammad's marriages after the death of Khadijah were contracted mostly for political or humanitarian reasons. The women were either widows of Muslims killed in battle and had been left without a protector, or belonged to important families or clans whom it was necessary to honor and strengthen alliances with.