Grannus and Sirona, A Compendium of the Ancient Gods

Next on the wallNantosuelta and Sucellus

Grannus was a Gallic god of healing and of warm springs, whom the Romans equated with Apollo; the great cult-center of Apollo Grannus stood at Aachen (Roman Aquae Granni — the "Waters of Grannus"), where the hot springs that the modern city is famous for were already a sanctuary in the Roman period. The Roman emperor Caracalla, suffering from disease, made a pilgrimage to Aachen to seek healing from Grannus in 213 CE; Cassius Dio records the visit. Other major Grannus cult-sites lay at Brigetio in Pannonia, at Trier, and at numerous spring-shrines throughout the Gallic and German provinces.

His consort was Sirona, sometimes Đirona — a goddess whose name means "the Star," and who was depicted with a snake, a basket of eggs, and a basket of fruit. The pair appeared together at many of the springs, with Grannus the male healer and Sirona the female fertility-and-renewal figure; their joint worship is attested at Hochscheid in the Mosel valley, where a small temple to the pair has been excavated, and at Bourbonne-les-Bains.

Sirona's iconography combined typical Gallic fertility attributes (the eggs, the fruits) with the snake (a healing emblem common throughout the ancient Mediterranean) and stellar imagery (her name and sometimes her crown). She was perhaps the most carefully attested goddess of the Gallo-Roman healing pantheon, and her cult survived into the third century. The figures of Grannus and Sirona represent the late synthesis of indigenous Celtic deity-pairs with Roman imperial-period religiosity, and are particularly interesting for showing how the Romans organized the cults of conquered peoples without entirely effacing their pre-Roman character.

Curator’s note

What the sources say, and what later tradition added. The sources for this bay

Grannus is attested in the Latin literary record by Cassius Dio (78.15.5-6, the Caracalla pilgrimage), and is named on numerous inscriptions throughout the western Empire; Wolfgang Spickermann's catalog (Religion in den germanischen Provinzen Roms, 2001) is comprehensive. Sirona is similarly known chiefly through inscriptions and from the Hochscheid temple (excavated 1962, materials in the Trier museum). The standard reference work on Gallic religion remains Miranda Green's various titles; Edith Wightman's Gallia Belgica (1985) is excellent on the regional context.

Kin in the sources

Each tie is quoted from the entry that states it.

Named as the same god asApollowhom the Romans equated with Apollo

The same god in other rooms

The ancient sources themselves name these as one god under different names. See Resheph, Helios, Apollo, Simios, Aplu, Belenos, Maponos and Grannus and Sirona hung together

When the sources speak

Dated witnesses for The Celtic Mythologies. A date marks when the evidence was written down, not when the belief began. The whole timeline

2nd–1st millennia BCE: Indo-European language dispersals and regional Bronze Age cultures provide a remote comparative background, not a recoverable common canon.
c. 500 BCE–1 CE: Iron Age material culture, names, sanctuaries, and classical ethnography offer early but external evidence for Celtic and Germanic religions.
1st–4th centuries CE: Roman inscriptions and provincial cults preserve many Celtic, Germanic, and local divine names.
4th–8th centuries CE: Migration-period and early medieval conversion transform ritual institutions while heroic traditions continue.
8th–11th centuries CE: Viking Age poetry, runic evidence, archaeology, and Scandinavian conversion form the core context of Norse myth.
9th–12th centuries CE: Slavic, Baltic, and Finnic traditions enter chronicles and missionary accounts, often through hostile observers.
11th–14th centuries CE: Irish, Welsh, and Icelandic manuscripts preserve major narrative corpora in Christian literary environments.
12th–16th centuries CE: Saxo, saga compilers, Baltic chroniclers, and later antiquarians systematize or reinterpret older material.