"On the other hand, however, Muslims who calculate 'Ayesha's age based on details of her sister Asma's age, about whom more is known, as well as on details of the Hijra (the Prophet's migration from Mecca to Madina), maintain that she was over thirteen and perhaps between seventeen and nineteen when she got married. Such views cohere with those Ahadith that claim that at her marriage Ayesha had "good knowledge of Ancient Arabic poetry and genealogy" and "pronounced the fundamental rules of Arabic Islamic ethics.""