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.
Ahl al-Kisa
Some Sunni scholars remark that the "purification verse" was revealed concerning five people: Muhammad, Ali, Fatimah, Hassan and Husayn. Others maintain that the "purification verse" cannot refer to the inerrancy of the Imams because the context in which it occurs relates to the wives of Muhammad and necessitates that it, too, should refer to them, or that at the very least they cannot be excluded from the category it addresses. If it were to imply inerrancy, then the wives of Muhammad would also have to be inerrant, a belief that Sunni scholars do not hold. Shia scholars, however, do believe in the infallibility of Muhammad. Ibn Kathir in his tafsir of the relevant verse says "the [Sunni] scholars are unanimously agreed that [Muhammad's wives] were the reason for revelation in this case...but others may be included by way of generalization."