Plutarch’s Parallel Lives are well known; less so the essays and dialogues grouped into his omnibus Moralia. One of these essays, De E apud Delphos (“De E”), contains a discussion of the meaning of a votive object, in the form of the letter E, first offered by the seven Sages to the Delphian god. This translation, with its commentary, pays attention to technical matters discussed in the dialogue (number theory, the altar at Delos, the pentad, syllogistic logic, Being and Becoming) that have sometimes been neglected in other translations. It also comments on themes encountered in the dialogue (divination, divine aid and prophecy, and nostalgia). Plutarch’s description of the world at Delphi rewards the reader with insights into an intellectual, scientific, religious, and social world that has long departed.