Siraj al-Din al-Sajawandi
Sirāj ud-Dīn 'Muhammad ibn Muhammad ibn 'Abd ur-Rashīd Sajāwandī also known as Abū Tāhir Muhammad al-Sajāwandī al-Hanafī and the honorific Sirāj ud-Dīn' was a 12th-century Hanafi scholar of Islamic inheritance jurisprudence, mathematics astrology and geography. He is primarily known for his work Kitāb al-Farāʼiḍ al-Sirājīyah, commonly known simply as "the Sirājīyah", which is a principal work on Hanafi inheritance law. The work was translated into English by Sir William Jones in 1792 for subsequent use in the courts of British India. 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.
Name
His full name is Sirāj ud-Dīn Abū Tāhir Muḥammad Ibn Muhammad ibn 'Abd ur-Rashīd ibn Tayfoūr Sajāwandī. 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".Works
Kitāb al-Farāʼiẓ al-Sirājīyah a.k.a. al-Sirājīyah al-Tajnīs Fī al-Hasāb- ''Resālat Fī al-Jabr wa al-Muqābilah''