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Mullo is aCeltic god. He is known from inscriptions and is associated with the godMars in the form of Mars Mullo.
The cult of the god was popular in northern and north-westernGaul, particular inBrittany andNormandy. The wordMullo may denote an association with horses or mules (it is the Latin word for 'mule').
Mars Mullo had a circular temple atCraon in theMayenne, situated on a hillock commanding a confluence of two rivers. An inscription atNantes reflects the presence of a shrine there. An important cult centre must have existed atRennes, the tribal capital of theRedones; inscriptions there refer to the one-time presence of statues and to the existence of an official public cult. Town magistrates were instrumental in setting up urban sanctuaries to Mullo in the 2nd century AD. AtAllonnes, Sarthe a shrine was set up to Mars Mullo as a healer of afflictions of the eye. His importance is suggested by his link withAugustus on a dedicatory inscription. Pilgrims visited the shrine offered numerous coins to the god, along with votive images of the afflicted parts of their bodies, the eye problems clearly manifest.