Calogerus was a hermit who, like many in Christian and Byzantine times, lived on the Aeolian Islands, especially Lipari. Calogerus was tasked with purging the island from the devils that infested it, by throwing them into the crater of Vulcano. Legends attributed him with many miracles, such as making the lost waters return to the thermal spring, which retains his name, and extinguishing the fire of the crater of Pirrera in Lipari, which terrified the inhabitants of the island.
