The effects of Avicennism in were later submerged by the much more influential Averroism, the Aristotelianism of Averroes, one of the most influential Muslim philosophers in the West. Averroes disagreed with Avicenna's interpretations of Aristotle in areas such as the unity of the intellect, and it was his interpretation of Aristotle which had the most influence in medieval Europe. Dante Aligheri argues along Averroist lines for a secularist theory of the state in "De Monarchia". Averroes also developed the concept of "existence precedes essence". Al-Ghazali also had an important influence on medieval Christian philosopher along with Jewish thinkers like Maimonides.