This dual-language book is a translation of John Pecham's De aeternitate mundi (On the Eternity of the World), written probably in 1270. Pecham was born in England around 1230. He pursued studies in Paris, where he may have been a student of Roger Bacon's, and at Oxford. He returned to Paris some time between 1257 and 1259 to study theology and in 1269-1270 became magister theologiae. It was at this time that he presumably wrote the essay translated here, and presented it as part of his inception, the equivalent of a doctrinal defense, in 1271, when he sought to become a magister regens, a...