 As noted most of those working in the falsafa tradition drew their inspiration from Aristotle and his later commentators, the most notable exception was the independent philosopher-physician Abū Bakr al-Rāzī (ca. 864–925 or 930), whose natural philosophy and cosmology happily drew upon Arabic versions of Plato’s Timeaus as well as certain non-Greek sources. Al-Rāzī maintained that there were five eternals: (1) the Creator, (2) the Universal Soul, (3) prime matter, (4) absolute time and (5) absolute space (understood as something like void space) (al-Razi 1939, 195–215). The first three eternal principles find their counterparts in the natural philosophy of the Neoplatonizing Aristotelians in the Islamic world, whereas it is the last two notions that truly set al-Razi apart from other medieval natural philosophers.