 Posidonius completed his higher education in Athens, where he was a student of the aged Panaetius, the head of the Stoic school.But soon he came in conflict with the Stoic doctrines and was involved in heated debates with many other Stoic philosophers of the school.The incidents concerning Posidonius's conflict and final break up with the Stoics are mentioned by Galen in his book "On the Doctrines of Plato and Hippocrates".