Astragaloi

Astragaloi, the ankle bones of sheep or goats, were used across the ancient Greek and wider Mediterranean world both as ordinary children's game pieces and, cast in sets and read according to the combination of sides on which they landed, as instruments of divination, a practice modern scholarship terms astragalomancy. Because the bone is naturally irregular, roughly rectangular but distinctly asymmetric, it can land in four recognisably different resting positions rather than the two a coin offers, which gave diviners a richer, more finely graded set of possible outcomes to interpret from a single throw than a simple binary lot could provide.

Halliday's classic study of Greek divination situates astragalomancy among a wider family of Greek lot casting practices, cleromancy in the broad sense, and records specific oracular sites where astragaloi divination was formally practised, including sanctuaries associated with Heracles, where inscribed tables survive listing which combination of thrown bones corresponded to which oracular response, giving modern scholars an unusually direct, textually documented window into exactly how this particular form of divination actually operated in practice.

The same object served an entirely secular purpose as a game piece, thrown for simple games of chance among adults and children alike across Greek and later Roman society, and archaeological finds of worked, sometimes decoratively carved or weighted astragaloi in domestic and funerary contexts far outnumber the more specifically oracular examples, indicating that everyday play was always the more common use of the bone even where its divinatory application is comparatively well documented in the literary and epigraphic record. Halliday's survey treats this dual use, sacred lot and secular toy occupying the very same physical object, as characteristic of ancient Mediterranean divination more broadly, in which the boundary between a game of chance and a genuine inquiry into divine will could be thinner, and more context dependent, than a modern reader accustomed to sharper categories might expect.

Astragaloi divination declined along with the wider system of Greek oracular practice in late antiquity, and the astragalos survives today mainly as an archaeological curiosity and a documented historical practice rather than as any living form of divination still consulted for guidance. Later Roman and Byzantine sources continued to describe astragalomancy as a recognised, if increasingly antiquarian, practice long after its most active period, suggesting the method persisted in some form well beyond its classical Greek heyday.