April 13
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April 13 is the 103rd day of the year (104th in leap years) in the Gregorian calendar; 262 days remain until the end of the year.
- 685 CE - Death of Marwan b. al-Hakam (Ramadan 3, 65)
- 1913 CE – Birth of Sayyid Muhammad 'Ali Qadi Tabataba'i, the first imam of Friday Prayer who was martyred in Iran (Jumada I 6, 1331 AH).