Antiochus' legend states that he was condemned to work the mines on the island that now bears his name. The island, at the time inhospitable and isolated, was named Plumbaria at the time, after its source of lead (plumbum). His legend also states that he was a physician during the reign of Hadrian. He had converted many people in Cappadocia and Galatia to the Christian religion, and was therefore tortured and sent into exile by the authorities. Antiochus, however, converted his jailer Cyriacus at Sardinia, and had built a small underground oratory on Plumbaria, and was thus condemned to death there.