Rudiobus is a Celtic god

Celtic polytheism

Celtic polytheism, commonly known as Celtic paganism, refers to the religious beliefs and practices adhered to by the Iron Age peoples of Western Europe now known as the Celts, roughly between 500 BCE and 500 CE, spanning the La Tène period and the Roman era, and in the case of the Insular Celts...

 known only from a single inscription, on a bronze figurine of a prancing horse: "sacred to the god Rudiobus". This figurine is one a group found at Neuvy-En-Sullias

Neuvy-en-Sullias

Neuvy-en-Sullias is a commune in the Loiret department located in north-central France.-See also:*Communes of the Loiret department...

 (Loiret

Loiret

Loiret is a department in north-central FranceThe department is named after the river Loiret, a tributary of the Loire. The Loiret is located wholly within the department.- History :...

). Horses were linked to many other Celtic deities, including the sky-god and the Celtic version of Mars

Mars (mythology)

Mars was the Roman god of war and also an agricultural guardian, a combination characteristic of early Rome. He was second in importance only to Jupiter, and he was the most prominent of the military gods worshipped by the Roman legions...

. The name "Rudiobus" may refer to the colour red.