Medieval philosophy refers to philosophy in Western Europe between the decline of classical pagan culture and the rediscovery of ancient philosophy during the Renaissance. The most significant influence on medieval philosophy was Christianity, as Christian institutions supported intellectual life and provided subjects for philosophical reflection. Philosophy focused on problems of salvation and the afterlife rather than nature. It was theocentric and centered around the belief in one God. The works of Aristotle and Plato were rediscovered and studied in the 12th century, marking a "golden age" of medieval philosophy concerning religion, logic, and metaphysics. Two influential Roman philosophers were Boethius and Augustine, with Augustine integrating Neoplatonism into Christian doctrine.