Plato and Aristotle dominated ancient philosophy.
Usually attention is focused upon these great philosophers of the Socratic era who provided much of the edifice upon which philosophy has been constructed. Consequently medieval philosophy is greatly ignored and even in some instances avoided. Regarding the time of its existence, medieval philosophy covers the era from the fall of the Roman Empire to the period of the Renaissance.
During this time, because every important philosopher was an ecclesiastic, the study of medieval philosophy is avoided by some since the conclusion of many is that the allegiance to religion was so great by the medieval ecclesiastic philosophers that the genuine search for truth was sacrificed as a result. It is said of medieval philosophy that it spent much of its time defending what was already believed by the philosophers of the era rather than being actually engaged in the search for truth.
Among the greatest of the Medieval Philosophers were two giants: Augustine and Aquinas.
