“At that time there was in Cordoba a group of doctors who were keen to find out by research and inquiry the Arabic names of the simple remedies of Dioscorides that were [still] unknown; and from the court of King ‘Abd ar-Rahman an-Nasir they were encouraged in that research by the Jew Hasday b. Shaprut. Above all he favored and honored Nicholas the monk, who explained the names of the unknown remedies in the book of Dioscorides. …Among the doctors who were then making research into the names of the remedies in the book, and determining the characteristics of each, were Muhammad known as ash-Shajjar, a man called al-Bisbasi, Abi ‘Uthman al-Hazzaz nicknamed al-Yabisa, Muhammad b. Sa’id the Doctor, ‘Abd ar-Rahman b. Ishaq b. Haytham, and Abu ‘Abdallah the Sicilian, who spoke [Byzantine] Greek and understood the characteristics of remedies.
“This group was all present at the same time as Nicholas the monk; I was his and their contemporary in the time of Mustansir, and associated with them in the time of Mustansir al-Hakam; Nicholas the monk died early in his reign. Thus the book of Dioscorides was revised through the research of these few men into the names of remedies.
Source: Hourani, George F. “The Early Growth of the Secular Sciences in Andalusia.” Studia Islamica 32 (1970): 143-56.