A manuscript preserved in the Bibliothèque royale de Belgique of the Liber Pantegni by the Tunisian Muslim merchant-turned-monk, Constantinus Africanus, who traveled to Italy, converted to Christianity, and worked at the Abbey of Monte Cassino toward the end of the 11th century, is the earliest surviving copy of Constantinus's work, characterized as "the earliest Western medical treatise."
A compendium of Hellenistic and Islamic medicine, and to a large extent a translation of the Kitab al-malaki "Royal Book" of the Persian physician and psychologist Ali ibn al-Abbas, Constantinus's' Liber pantegni (παντεχνη "[encompassing] all [medical] arts") became a standard text at the Schola Medica Salernitana, the first European medical school, and was highly influential throughout the middle ages.
♦ You can download a digital facsimile of the manuscript at this link.
