In Celtic mythology Taranis was the god of thunder worshipped primarily in Gaul, Gallaecia, the British Isles, but also in the Rhineland and Danube regions, amongst others. Taranis, along with Esus and Toutatis as part of a sacred triad, was mentioned by the Roman poet Lucan in his epic poem Pharsalia as a Celtic deity to whom human sacrificial offerings were made. Taranis was associated, as was the cyclops Brontes ("thunder") in Greek mythology, with the wheel.