Grannus
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In Celtic mythology, Grannus (also Gramnos, Gramnnos) was a god of healing and mineral springs. His cult was centered in Aquae Granni (now Aachen, Germany). He was equated with Apollo in Roman times. He was married to Sirona. He is likely the same as Borvo.
He was no doubt a sun god: the Irish for "sun" is grian (see also Deò-ghrèine and Mac Gréine).
The Roman Emperor Caracalla (188AD to 217AD) visited the shrine of "the Celtic healing-god" Grannus during the war with Germany in about 215.