Worship of the Egyptian goddess Isis dates as far back as 2500 B.C. and extended at least until the fifth century A.D. throughout the Roman world. The importance of her cult is attested to in Apuleius's Golden Ass, and evidence of its influence has been found in places as far apart as Afghanistan and Portugal, the Black Sea and northern England. The first study to document the extent and complexity of the cult's influence on Graeco-Roman and early Christian culture, R. E. Witt's acclaimed Isis in the Ancient World is now available in paperback.