Jonah ibn Janah

Jonah ibn Janah or Abū al-Walīd Marwān ibn Janāḥ, , was a Jewish rabbi, physician and Hebrew grammarian active in al-Andalus. Born in Córdoba, ibn Janah was mentored there by Isaac ibn Gikatilla and Isaac ibn Mar Saul ben Levi before he moved around 1012 due to the siege and sack of the city by Berbers. He then settled in Zaragoza, where he wrote Kitab al-Mustalhaq, which expanded on the research of Judah ben David Hayyuj and led to a series of controversial exchanges with Samuel ibn Naghrillah that remained unresolved during their lifetimes.