Sirenum scopuli

According to the Roman poets Virgil (Aeneid, book v.864) and Ovid, the Sirenum scopuli were three small rocky islands where the Sirens of Greek mythology lived and lured sailors to their deaths. "The Sirenum Scopuli are sharp rocks that stand about a stone's throw from the south side of the island" of Capri, was Joseph Addison's confident identification.