Predominator

pree-DOM-i-nay-tor

greek: ἐπικρατήτωρ (Epikratetor)

Definition

The Predominator (Greek epikratetor) is the part of a chart that Hellenistic astrologers judged to hold the most life-force — usually the sect light (the Sun by day, the Moon by night), and sometimes the Ascendant, Midheaven, or another well-placed point. Pinning down the Predominator is the first step for several length-of-life techniques, and for naming the Master of the Nativity (oikodespotes) as the planet that rules it. The term is close kin to the releaser or prorogator (aphetes) and to the medieval hyleg of the Persian-Arabic tradition.

In Tradition

In Hellenistic length-of-life doctrine, the Predominator is the point from which vitality is measured — it marks where the chart's strongest life-force sits, and the planet that rules it, the Master of the Nativity, becomes the factor whose condition shapes the longevity reading. The Predominator is chosen through a sect-aware run-through of candidate places, with the Ascendant or Midheaven kept as a fallback when no luminary or planet qualifies.

In Practice

The astrologer begins a length-of-life analysis by picking the Predominator from a ranked list, weighed by sect: the luminary of the sect (the Sun by day, the Moon by night) is checked first, then the other luminary, then other strongly placed points, with the Ascendant or Midheaven as the fallback. Hellenistic authors set out different qualifying-place lists and witnessing requirements — Ptolemy needs a candidate planet above the horizon, while Valens allows any strong place counted from the Ascendant. Once the Predominator is fixed, its domicile lord — and, in Porphyry's system, its bound lord as joint ruler — is named the Master of the Nativity; the Master's planetary-years figures and condition then feed the longevity calculation, while the Predominator itself is directed toward destructive degrees and the rays of the malefics. Modern practitioners use the Predominator more as a marker of vitality than a literal lifespan calculator, and treat the disagreement among the ancient selection rules as an unsettled area.

Historical Origin

The epikratetor, or Predominator, belongs to Hellenistic length-of-life doctrine and is treated, with differing selection rules, by Ptolemy, Dorotheus, Valens, Porphyry, Paulus, and Firmicus. Chris Brennan's glossary defines it as a well-placed planet partly standing for a person's life-force, flagging full length-of-life reconstruction as deferred. Demetra George's Ancient Astrology in Theory and Practice and Joseph Crane's Astrological Roots both reconstruct the Predominator-to-Master sequence in detail. The doctrine continues in the Persian-Arabic transmission as the hyleg.

Etymology

Origin: Greek. Meaning: Predominator, ruler-over, holder of dominion.

Definition

In Tradition

In Practice

Historical Origin

Etymology

Further Reading