Galen (131-201) was a Greek anatomist, physician, and writer whose theories formed the basis of European medicine until the Renaissance. Avicenna, Latinization of name of Ibn Sina (980-1037), Persian philosopher and physician. (Full name Abu Ali al-Husayn ibn Abd Allah ibn Sina al-Balkhi) Avicenna was an Arab philosopher and physician whose philosophical writings, which combined Aristotelianism with neo-Platonist ideas, greatly influenced scholasticism, and whose medical work Qanun was the greatest single influence on medieval medicine. Hippocrates, (460-370 BC), called "the Father of Medicine" was a Greek physician who laid the foundations of scientific medicine by freeing medical study from the constraints of philosophical speculation and superstition. He is traditionally but inaccurately considered the author of the Hippocratic oath.