Iulius Africanus (3rd cent.) is a fascinating intellectual in a period of transition. Author of the first Christian world chronicle (Chronographiae), he also wrote a comprehensive and multifaceted manual of many fields of knowledge, where the religious character is open to debate. The preserved fragments of the Cesti treat military, technical, medical and many other topics. These texts are presented in an entirely new critical edition, based on a thorough analysis of all channels of transmission. The edition is accompanied by notes and a new English translation.