The Tyrrhenians (Attic Greek: Τυρρηνοί Turrhēnoi) or Tyrsenians (Ionic: Τυρσηνοί Tursēnoi; Doric: Τυρσανοί Tursānoi) is an exonym used by Greek authors to refer to a non-Greek people. While ancient sources have been interpreted in a variety of ways, one theory identifies the Tyrsenians with the Etruscan, Raeti, and Lemnian cultures, whose languages have been grouped together as the Tyrsenian languages based on strong similarities in their written languages.