Among the gods, Mercury has the most important cult; his sacred images are very frequent. The Gauls call him the inventor of every art and skill, the guide on roadways and journeys, and they believe he has the greatest power over trade and the pursuit of profit. After him, they venerate Apollo, Mars, Jupiter, and Minerva. Of these, they think in much the same way as other peoples do, holding that Apollo dispels disease, Minerva passes along the foundations of arts and crafts, Jupiter rules the heavenly gods, and Mars governs war. (Caesar, "Gallic War" 6.17.1)