“The Tree of Hippocrates is the plane tree (or platane, in Europe) under which, according to the legend, Hippocrates of Kos (considered the father of medicine) taught his pupils the art of medicine. Paul of Tarsus purportedly taught here as well. The Platanus in Kos is an oriental plane (Platanus orientalis), with a crown diameter of about 12 metres, said to be the largest for a plane tree in Europe.”
http://en.wikipedia.org/wiki/Tree_of_Hippocrates