Galli gallus Phrygian goddess Cybele (Magna Mater in Rome

 A gallus (pl. galli) was a eunuch priest of the Phrygian goddess Cybele (Magna Mater in Rome) and her consort Attis, whose worship was incorporated into the state religious practices of ancient Rome.

Cybele's cult may have originated in Mesopotamia,[1] arriving in Greece around 300 BCE.[2] It originally kept its sacred symbol, a black meteorite, in a temple called the Megalesion in Pessinus in modern Turkey.

Relief of an archigallus making sacrifices to Cybele and Attis, Museo Archeologico Ostiense, Ostia Antica

Statue of a gallus priest, 2nd century, Musei Capitolini

Funerary relief of an archigallus from Lavinium, mid-2nd century AD, Capitoline Museums, Rome