Grannus was a Celtic deity of classical antiquity. Based on the etymology of his name, Grannus may have been associated with spas, thermal springs, and the sun; having bushy hair, beard and/or eyebrows; or having a connection with the concept of shining/gleaming. He was regularly identified with Apollo as Apollo Grannus. He was frequently worshipped in conjunction with Sirona, and sometimes with Mars and other deities.
Name
Etymology
In the early twentieth century, the name was connected with the Irishgrian, ‘sun’. Along these lines, the god was often linked to the Deò-ghrèine and the character Mac Gréine of Irish mythology. However, the Irish grian, ‘sun’ is thought to be derived from Proto-Celtic *greinā ‘sun’ and the Proto-Celtic *greinā is unlikely to have developed into Grannos in Gaulish and other Continental Celtic languages. Derivation from a Proto-Celtic root *granno- ‘beard’ has enjoyed some scholarly support, from which Jürgen Zeidler dissents, proposing a different root *granno- with "probable reference to the sun's heat and healing properties". Ranko Matasović, in his Etymological Dictionary of Proto-Celtic, has tentatively proposed that the root of this theonym comes from Proto-Celtic *gwrenso-, which means "heat"; however, Proto-Celtic initial gw- yields b- in Gaulish.
Epithets
At Monthelon, Grannus is called Deus Apollo Grannus Amarcolitanus, and at Horbourg-WihrApollo Grannus Mogounus. In all of his centres of worship where he is assimilated to a Roman god, Grannus was identified with Apollo, presumably in Apollo's role as a healing or solar deity. In Trier, he is identified more specifically with Phoebus as Apollo Grannus Phoebus.
Centres of worship
One of the god's most famous cult centres was at Aquae Granni. Aachen means ‘water’ in Old High German, a calque of the Roman name of "Aquae Granni". The town's hot springs with temperatures between 45 °C and 75 °C lay in the somewhat inhospitably marshy area around Aachen's basin-shaped valley region. Aachen first became a curative centre in Hallstatt times. According to Cassius Dio, the Roman EmperorCaracalla unsuccessfully sought help from Apollo Grannus—as well as Aesculapius and Serapis—during a bout of physical and mental illness, visiting the god's shrine and making many votive offerings; Dio claims that the gods refused to heal him because they knew Caracalla's intentions to be evil. Caracalla's visit to the shrine of ‘the Celtic healing-god’ Grannus was during the war with Germany in 213. In the early twentieth century, the god was said to have still been remembered in a chant sung round bonfires in Auvergne, in which a grain is set on fire, and called Granno mio, while the people sing, “Granno, my friend; Granno, my father; Granno, my mother”. However, granno may simply be a derivative of an Occitan word of Latin origin meaning "grain".
Festival
A 1st century AD Latin inscription from a public fountain in Limoges mentions a Gaulish ten-night festival of Grannus : Translation: "The vergobretus Postumus son of Dumnorix gave from his own money the Aqua Martia for the ten-night festival of Grannus".
Divine entourage
The name Grannus is sometimes accompanied by those of other deities in the inscriptions. In Augsburg, he is found with both Diana and Sirona; he is again invoked with Sirona at Rome, Bitburg, Baumberg, Lauingen, and Sarmizegetusa. At Ennetach he is with Nymphs, at Faimingen with Hygieia and the Mother of the Gods, and at Grand with Sol. A votive altar at Astorga invokes him after "holy Serapis" and "the many-named Isis", and before "the unvanquished Core and Mars Sagatus".
