Benvenutus Grassus

Benevenutus Grassus Hierosolimitanus (also called Benevenutus Grapheus/Crassus or Benvenuto Grassi of Jerusalem) (c. 1200-c. 1290 The oldest printed version of his book is edited by Severino of Ferrara from 1474. A copy of this was translated into English by Casey Albert Wood in 1929. The work of Benvenutus Grassus also made use of the works of Ali Ibn Isa's Tadhkirat al-Kahhalin (" The Oculists' Memorandum Book ") which was probably published in the 11th century.

A study of a German translation has suggested that Grassus studied at the Salernitan school of medicine which had connections to Arab medicine. The text claims that Grassus learnt from a variety of sources and practiced by travelling to various places both in the temperate and tropic areas. He quotes Hippocrates, Galen, Johannicius and Hunayn bin Ishaq of Baghdad.