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.
Criticism of Muhammad
Some Western thinkers and Christian evangelicals criticize Muhammad for having had a child (Ibrahim, who died in infancy) by a slave girl called Maria al-Qibtiyya, one of his concubines who was a present from the Christian Byzantine ruler of Egypt. Sources, including Ibn Qayyim Al-Jawziyya claim that she was a concubine and not a slave. She is also not mentioned in Ibn-Hisham's notes on Ibn-Ishaq's biography where he lists the wives of Muhammad. According to a hadith, Muhammad left no slaves at the time of his death.