Kitab al-Kafi
Shia historians generally reject the claim Hasan al-Askari fathered children other than Hujjat-Allah al-Mahd. The Shia hadith book Kitab al-Kafi, in Bab Mawlid Abu Mahdi al-Hasan bin Ali confirms the Sufi claim that Hasan al-Askari had more than one wife. In his Usul, al-Kafi writes, "When the caliph got news of Imam Hasan 'Askari's illness, he instructed his agents to keep a constant watch over the house of the Imam.".