Age Difference Between Imam Hassan & Hussain (rta)
There was a difference of a year between them according to the historical records. You can start with short books and then go to detailed ones. History books by Mubashar Nazir, available online. Tarikh e Islam by Moindeen Nadwi, another by Najeeb Akbar Abadi, Tarikh ul Ummat by Aslam Jerajpuri, The spirit of Islam by Ameer Ali, and many others.
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