Ibn Khallikan
Muhammad ibn Jarir al-Tabari, born in Persia 200 years after Muhammmad's death, suggested that she was ten years old. Six hundred years after Muhammad, Ibn Khallikan recorded that she was nine years old at marriage, and twelve at consummation. Ibn Sa'd al-Baghdadi, born about 150 years after Muhammad's death, cited Hisham ibn Urwah as saying that she was nine years old at marriage, and twelve at consummation, but Hisham ibn Urwah's original source is otherwise unknown, and Ibn Sa'd al-Baghdadi's work does not have the high religious status of the Hadith.