May 13
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May 13 is the 133rd day of the year (134th in leap years) in the Gregorian calendar; 232 days remain until the end of the year.
- 628 CE - Inviting the rulers of neighboring countries by Prophet Muhammad (s) (Muharram 3, 7)
- 1800 CE - Birth of al-Shaykh Murtada al-Ansari (Dhu l-Hijja 18, 1214)
- 1873 CE - Birth of Abd Allah Mamaqani (Rabi' I 15, 1290)
- 1910 CE - Introduction of Sayyid Abu l-Hasan Isfahani as one of twenty mujtahids to verify the compatibility of the National Consultative Assembly's approvals with the rulings of Shi'a jurisprudence. (Jumada I 3, 1328)
- 1952 CE - Demise of Sayyiad Ali Akbar al-Khoei, the father of al-Sayyid Abu l-Qasim al-Khoei (Sha'ban 18, 1371)
- 2013 CE - Demise of Sayyid Muhammad Izz al-Din Husayni Zanjani (Rajab 3, 1434)
- 2014 CE - Demise of Sayyid Muhammad Baqir Shirazi (Rajab 13, 1435)