Idioprosopia

Definition

A planet is in its "proper face" — idioprosopia (Greek ἰδιοπροσωπία, "own face") — when it holds the same phase relationship to the Sun or Moon that it held under the original domicile assignments. This is a dignity condition, not the decan-face system. The two share the word prosopon ("face") but are separate doctrines, a confusion Brennan flags explicitly. Idioprosopia names a relationship a body is in; it is not a slice of the zodiac.

In Tradition

Brennan presents idioprosopia as Ptolemy's preferred favorable condition (Tetrabiblos 1.23.1), carried forward by Rhetorius: the planet echoes its domicile-era angle to a luminary, and that echo strengthens it. Valens puts the same condition to diagnostic use across his twelve-place doctrine. Benefics "in their proper places and in their proper faces" in the place of the Good Daimon make people illustrious and rich from youth; malefics so placed deepen the harm they signify. Proper face works as a dignity-amplifier.

In Practice

Compare a planet's phase angle to the Sun or Moon now against the angle it would hold in the domicile scheme. When they match, it is in proper face and reads as reinforced. The payoff is amplification: a well-placed benefic turns up the volume on its gifts, a malefic sharpens its difficulty. Do not confuse this with a body merely sitting in its own decan — that is the separate decan-face doctrine. Proper face is the phase relationship, not the location.

Historical Origin

Brennan describes the doctrine in Hellenistic Astrology (pp. 309-310), tracing it to Ptolemy (Tetrabiblos 1.23.1) and Rhetorius (Compendium 54). The applied use here is Vettius Valens', from Anthology Book II (pp. 29-30, in Mark Riley's translation), where "proper face" recurs as a dignity-modifier through the per-place delineations.

Etymology

Origin: Greek. Meaning: proper face; own appearance.

Further Reading

• Chris Brennan, Hellenistic Astrology
• Vettius Valens, Anthology