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The Ancient Greeks named the island Therassía ( Θηρασία ) and Thérmessa ( Θέρμεσσα, source of heat ).

The island appeared in their myths as the private workshop of the Olympian god Hephaestus, protector of the blacksmiths ; he owned another two at Etna and Olympus.

Strabo also mentions Thermessa as sacred place of Hephaestus ( ἱερὰ Ἡφαίστου ), but it's not clear if it was a third name for the island, or just an adjective.