Syncretism and the Hellenistic Sacred

Hellenistic religion is marked by deliberate syncretism, the conscious blending of Greek and local deities and cults across a newly interconnected Mediterranean and Near Eastern world. The clearest case is Serapis, a god promoted by the early Ptolemies at Alexandria who combined traits of the Egyptian Osiris and Apis bull cult with the iconography of Greek gods such as Zeus and Hades, designed deliberately to be worshipped by both Greek and Egyptian subjects of the new dynasty. Hellenistic kings increasingly claimed divine or semi-divine status, a ruler cult that built on earlier Egyptian and Near Eastern traditions of sacred kingship and that Alexander's own successors used to bind their new and religiously diverse territories to their persons.

The period also produced horoscopic astrology in something close to its later classical form, as Babylonian observational astronomy and omen tradition met Greek mathematics and philosophy, chiefly in Hellenistic Egypt, to yield a system of personal horoscopes cast for an individual's exact birth moment, a genuinely new technique rather than an older Mesopotamian practice merely renamed. Mystery cults, including those of Isis, Cybele and Mithras, spread widely from their regional origins to initiates across the Hellenistic and later Roman world, offering personal salvation and secret knowledge in a way the civic religion of the classical Greek polis had not emphasized. Chris Brennan's Hellenistic Astrology and Dorian Greenbaum's study of the Hellenistic daimon both treat this astrological and religious ferment as a defining feature of the age.