Ranging from Abai to Zeleia, from massive temples in Egypt to modest tombs in Turkey, oracles were a major feature of the religions of many ancient cultures until their demise under the Christian Roman emperors. This work is a guide to all the known oracles of the ancient world. The greater part of it is devoted to an alphabetical listing providing details of nearly 300 sites in more than 25 countries where oracles of one kind or another functioned in antiquity. The text is extensively cross-referenced and illustrated, and supplemented by indexes, a glossary, and a substantial introduction.