 By 1270, the ban on Aristotle's natural philosophy was a dead letter. Nevertheless, the Bishop of Paris, Étienne Tempier, convened a meeting of conservative theologians and in December 1270 banned the teaching of certain Aristotelian and Averroist doctrines at Paris. Thirteen propositions were listed as false and heretical, some relating to Averroes' doctrine of the soul and the doctrine of monopsychism, and others directed against Aristotle's theory of God as a passive Unmoved Mover. The banned propositions included:
