Ismāʿīlīs share the following Imāms with the Twelver Shīʿah, though some Ismailis do not recognise Hasan ibn Ali as the second Imam, and accordingly they number the Hussain through Jafar as one numeral lower than do the Twelvers.
Ismāʿīlīs share the following Imāms with the Twelver Shīʿah.Ismaili refer Imam Hasan as 1st Imam whereas Twelver refer Ali ibn Abi Talib as 1st Imam and Hasan ibn Ali as the second Imam. Hence Ismailis number the Hassan through Jafar as one numeral lower than do the Twelvers.