 And among the physicians whom he often refers such Galen, Hippocrates, Dioscorides, Refus, Tridon, Fergorius, Aristotle and Ibn Suleiman Isaac Israeli ben Solomon, he does not mention al-Razi.Books of these authors must have existed in Tunisia at that time.Tunisia was in constant contact with Rome, Athens and Byzantium by the sheer size of its economy, and the position of Tunisia in the midst of the Mediterranean Sea.