Lucan's Three Feared Gods of Gaul

The Roman poet Lucan, writing his epic Pharsalia in the 60s CE, names three Gaulish gods in a single dense passage: Teutates, Esus and Taranis, described as gods appeased with offerings that later commentary reads as human sacrifice, tribes horrified by rites even Rome itself would not perform. Lucan gives almost no further detail, and it is later scholiasts, medieval commentators glossing his text, who assign each god a Roman equivalent: Teutates to Mercury or Mars depending on the manuscript, Esus to Mercury or Mars as well, and Taranis consistently to Jupiter. That scholiastic gloss, written centuries after Lucan and drawing on assumptions about what an appropriate parallel should be rather than on direct testimony from Gaulish worshippers, is the single most influential ancient statement connecting a Celtic god to Jupiter, and it has shaped nearly every later account of Taranis. The name itself needs no such gloss to explain its meaning: Taranis is built on a Celtic word for thunder, a root that lives on in the Welsh taran and the Irish torann, so that even without Lucan's testimony the god's own name already names him as a power of the storm.