Chaldean

kal-DEE-uhn

greek: Χαλδαῖος (Khaldaios) · latin: Chaldaeus

Definition

Chaldean (Greek Khaldaios, Χαλδαῖος; Latin Chaldaeus, plural Chaldaei) is the Greek and Roman term for the Mesopotamian astrologers — the priestly class of celestial-omen interpreters who inherited and transmitted the Babylonian astrological tradition. Chris Brennan tracks the term's semantic evolution: originally a geographic and ethnic designation for a Mesopotamian area or people, then a class of priests from Mesopotamia thought to specialise in divination and astrology, and from the first century CE onward a generic Greek-Latin designation for astrologers in general, regardless of geographic origin — carrying with it the implication that astrology's roots traced back to Mesopotamia and its priestly class. James Holden cites the same trajectory through Plutarch, Sextus Empiricus, Aulus Gellius, Diodorus Siculus, Pliny, and the magi-in-Matthew tradition.

In Tradition

In the Hellenistic and Roman sources, "Chaldean" runs across two overlapping registers — narrow ethnic-priestly (the Chaldean people of southern Mesopotamia and their astrologer-priests) and broad professional-generic (any practitioner of astrology, regardless of origin). The Greek-Roman literary tradition tends to use the term ambiguously, and context usually has to settle which sense is meant. Vitruvius' On Architecture (9.6.2) cites the Chaldaeans as the foundational authorities on natal-astrology calculation — Berosus, who first brought Babylonian astrological doctrine to a Greek-speaking audience in the third century BCE, is the canonical figure of this transmission. The 139 BCE Roman edict of Cn. Cornelius Hispalus (preserved by Valerius Maximus) ordered the Chaldaei to leave Rome and Italy within ten days — testimony to both the term's currency in Roman public life and the political sensitivity around the practice.

In Practice

When you encounter "Chaldean" in classical or medieval astrological literature, read it through the dual-register framing: it may name a specific Babylonian-priestly transmission lineage, or it may be a generic literary term for "astrologer." The "Chaldean Order" — the sequence Saturn, Jupiter, Mars, Sun, Venus, Mercury, Moon — is one of the foundational orderings of the seven traditional planets, used in the planetary-hours scheme that names the days of the week and in much of the medieval-Latin and Renaissance astrological apparatus. Ptolemy's "Chaldean bounds" in Tetrabiblos I.23-24 are an alternative bound-system to the Egyptian bounds, but bear in mind that these are Ptolemy's scholarly attributions to a tradition-line and not necessarily a pure Babylonian inheritance. Modern scholarship — see Francesca Rochberg's New Evidence for the History of Astrology — has refined the picture of which Hellenistic doctrines actually trace back to Mesopotamian roots and which absorbed the prestigious-Chaldean label after the fact.

Historical Origin

The term Chaldean is attested across the entire Hellenistic and Roman literary corpus. Brennan's Chapter 2 in Hellenistic Astrology tracks its semantic evolution from geographic/ethnic through priestly-professional to generic-astrologer designation, citing Rochberg's scholarship on the transmission. The Valerius Maximus passage on the 139 BCE expulsion edict is one of the earliest extant Roman public-record references to the Chaldaei as a foreign-practitioner category. Holden traces the same usage through the Plutarch-Sulla report on death-prediction by "the Chaldeans" — the report's reception (Cramer's scepticism, the continued use of the label) illustrates the term's persistence into the Roman imperial period. The Chaldean Order of planets carries the term into the medieval Latin and Renaissance traditions as a technical sequence rather than an ethnic label.

Etymology

Origin: Greek (via Latin). Meaning: Of Chaldea; a Mesopotamian astrologer or, generically, any astrologer-practitioner.

Definition

In Tradition

In Practice

Historical Origin

Etymology

Further Reading