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The Magical Treatise of Solomon, sometimes known as Hygromanteia (Greek: Ὑγρομαντεία) or Hygromancy of Solomon, the Solomonikê (Σολομωνική), or even Little Key of the Whole Art of Hygromancy, Found by Several Craftsmen and by the Holy Prophet Solomon, refers to a group of similar late Byzantine-era grimoires purporting to contain Solomon's instructions to his son Rehoboam on various magical techniques and tools to summon and control different spirits, those spirits' powers, astrological beliefs, select charms, different means of divination, and the magical uses of herbs.