"ابن الجزار" (Ibn al-Jazzar) refers to

Ahmad ibn Ibrahim ibn al-Jazzar al-Qalawi (أحمد بن إبراهيم بن الجزّار القلّاوي)

. He was a prominent and influential 10th-century Andalusian physician and author of several important medical works. He[SQ]s particularly known for his *Zad al-Musafir* (Provision of the Traveler), a comprehensive medical text that was widely studied and translated into other languages. His work significantly impacted the development of medicine in the Islamic world and beyond.