April 20
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- 613 CE - Marriage of the Prophet (s) with A'isha (Shawwal 2, 1 BH)
- 630 CE – First Zakat collection (Muharram 1, 9)
- 702 CE – Birth of Imam al-Sadiq (a) (d. 148/765), the sixth Imam of Shi'a (Rabi' I 17, 83 AH)
- 851 CE – Demise of Abu l-Salt al-Harawi (Shawwal 14, 236)
- 1911 CE – Birth of Muhammad Taqi Danishpazhuh (Rabi' II 20, 1329)
- 1944 CE – Demise of Sayyid Muhammad Hasan Husayni known as Aqa Najafi Quchani (Rabi' II 26, 1363)
- 1987 CE – Demise of Muhammad Taqi Shari'ati Mazinani (Sha'ban 20, 1407)