| Abū Tāhir Muhammad Sajāwandī | |
| Birth Date: | 12th century CE |
| Birth Place: | Sajawand, Zabulistan, Ghaznavid Empire (modern-day Afghanistan) |
| Death Date: | 1203 CE |
| Death Place: | Sajawand, Zabulistan, Ghorid Empire (modern-day Afghanistan) |
| Era: | Islamic Golden Age |
| Main Interests: | Islamic inheritance jurisprudence, mathematics, astrology, geography, theology |
| Major Works: | The Sirajiyya, The Analogy for the Calculations, Treatise on Algebra |
| Influenced: | Ali ibn Mohammed al-Jurjani, Shahab ud-Din Ahmad ibn Mahmud al-Siwasi, Burhan ud-Din Haidar ibn Muhammad al-Hirwi, Shams ud-Din ibn Hamza al-Fanari, Abdul Karim ibn Muhammad al-Hamdani |
Sirāj ud-Dīn Muhammad ibn Muhammad ibn 'Abd ur-Rashīd Sajāwandī (Persian: محمد ابن محمد ابن عبدالرشید سجاوندی) also known as Abū Tāhir Muhammad al-Sajāwandī al-Hanafī (Arabic: ابی طاهر محمد السجاوندي الحنفي) and the honorific Sirāj ud-Dīn (سراج الدین, "lamp of the faith") (died c. 1203 CE or 600 AH)[1] was a 12th-century Hanafi scholar of Islamic inheritance jurisprudence, mathematics[2] astrology and geography.[3] He is primarily known for his work Kitāb al-Farāʼiḍ al-Sirājīyah (Arabic:کتاب الفرائض السراجیه), commonly known simply as "the Sirājīyah", which is a principal work on Hanafi inheritance law.[4] The work was translated into English by Sir William Jones in 1792 for subsequent use in the courts of British India.[5] [6] He was the grand-nephew of qari Muhammad ibn Tayfour Sajawandi. He lies buried in the Ziārat-e Hazrat-o 'Āshiqān wa Ārifān in Sajawand.[7]
His full name is Sirāj ud-Dīn Abū Tāhir Muḥammad Ibn Muhammad ibn 'Abd ur-Rashīd ibn Tayfoūr Sajāwandī (Persian: سراج الدین محمد سجاوندی). His nasab, Ibn Muhammad ibn 'Abd ur-Rashīd ibn Tayfoūr refers to him being the "son of Muhammad son of 'Abd ur-Rashīd son of Tayfour". Sajāwandī is his nisbah meaning "from Sajawand". He is also known by the teknonym Abū Tāhir meaning "father of Tahir".