Abstract De principis salute consulere: The practice of highly treasonable exploration of the emperor’s life expectance or of his successor’s name. The article introduces two procedures of the fortune-telling exploration mentioned in Coll. 15,2,3, until now not described in detail in legal historical papers. The first procedure was an algorithm for determining the reigning emperor’s life expectance described in a 4th century magical papyrus, having a Chinese parallel text of the 3th or 4th century; though the Chinese algorithm was made for another use, there was a remarkably structural similarity to the papyrus algorithm. The second procedure was performed in 371 A. D. for determining the name of the still reigning emperor’s successor, imitating the Delphic oracle ritual; it was sometimes mentioned by Byzantine historians.
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