It refers to the isle of Lemnos.
Lipstick Lemnians are hot!
...Otanes [a Persian commander] became the successor to Megabazus' command, and captured Byzantium, Chalcedon, Antandrus in Troas, and Lamponium. Taking a fleet from the Lesbians, he captured Lemnos and Imbros, both of which were still inhabited by Pelasgians at the time.