Ibn Muʿādh al-Jayyānī - Encyclopaedia of Islam, THREE
[Article]
Samsó, Julio
Leiden
Brill
(1,284 words)
Abū ʿAbdallāh (or Abū Bakr) Muḥammad b. Ibrāhīm b. Muḥammad b. Muʿādh al-Shaʿbānī al-Jayyānī, known as Ibn Muʿādh al-Jayyānī (d. Dhū l-Ḥijja 485/January 1093), was an astronomer and mathematician from Jayyān (Jaén) in al-Andalus. He lived in that city, where he was a faqīh (jurisprudent) and qāḍī (judge) and a member of a well-known family of legal scholars. There is no evidence that he ever travelled to the East, although some of his works (Villuendas, Trigonometría ) bear witness to his knowledge of Eastern