In Etruscan mythology
, Tyrrhenus (in el|Τυῤῥηνός) was one of the founders of the Etruscan League
of twelve cities, along with his brother Tarchon
describes him as the saviour of the Etruscans, because he led them from Lydia
; however this Lydian origin is to be debated as it contradicts cultural and linguistic evidence, as well as the view held by both the Etruscans themselves and by other Etrusco-Roman and Greek ancient sources.
[Nancy Thomson de Grummond, Etruscan Myth, Sacred History, and Legend, "Foundation Myths and Legends"; pp. 201-208.
His name was given to the Etruscan people by the Greeks. The Romans extended this use to the sea west of Etruria: the Tyrrhenian Sea