A spa town founded by the Romans in the first century,
who developed the thermal baths and called the place “Ivaonum”, possibly after a deity, Ivaos.
It became a place of pilgrimage after the sixth century, because of the tomb of the Christian hermit Marien.
The Roman baths, abandoned since the fifth century,
became popular again at the beginning of the XVIIth century and again in the XIXth century.

The spa is still in use today offering both medical and non-medical treatments.