January 20
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January 20 is the 20th day of the year in the Gregorian calendar; 345 days remain until the end of the year (346 in leap years).
- 630 CE - The Battle of Hunayn (Ramadan 29, 8)
- 820 CE – Death of Muhammad b. Idris al-Shafi'i the third prominent faqih (jurist) of Sunni jurisprudential thoughts, (Rajab 30, 204 AH)
- 1870 CE - Demise of Sayyid Muhammad Quli Naqawi Nayshaburi (Shawwal 17, 1286)
- 1953 CE - Demise of Haydar Quli Sardar Kabuli, a jurist, Muhaddith, and the author of al-Arba'in fi fada'il Amir al-Mu'minin. (Jumada I 4, 1372)
- 1985 CE - Demise of Sayyid Ahmad Khwansari (Rabi' II 27, 1405)
- 2001 CE - Demise of Mahdi Ha'iri Tihrani (Shawwal 24, 1421)
- 2021 CE - Demise of Sayyid Muhammad Hasan 'Alavi, one of the scholars of Sabzevar. (Jumada II 6, 1442)