Heptameron

The Heptameron, attributed to Peter of Abano, is a concise Renaissance manual of ceremonial magic organized around the seven days of the week and their planetary powers. It is significant for its clear ritual structure and influence on later magical handbooks, offering instructions for conjurations, circles, divine names, and appropriate times for operation.

Peter of Abano (Pietro d'Abano, c. 1257–c. 1316) was an Italian physician, philosopher, and scholar whose works became influential in learned magic, astrology, and natural philosophy. He is associated with the transmission of Arabic and Aristotelian science into Latin Europe, and later occult writers frequently cited him for his discussions of celestial influences and talismanic practices.