Portrait of persian AVICENNA (Ibn Sina, c.980 1037). Avicenna and Rhasiz (Rasis, Rhazes, 865 930 ac or ce), engraving on the title page of book" Praesens maximus codex est totius scientiae medicinae..", published in 1523. Besides philosophy and medicine, Avicenna's corpus includes writings on astronomy, alchemy, geography and geology, psychology, Islamic theology, logic, mathematics, physics and poetry