“Arezzo * Cerveteri * Chiusi * Cortona * Perugia * Populonia * Veii * Tarquinia-Corneto * Vetulonia * Volterra * Bolsena * Volci
The Aeolian Greeks, Ionian Greeks, and Etruscans all preserved ancient memories of how their ancestors were linked together in leagues of twelve that jointly honored a sacred place. No definitive list survives, however. The cities above are the most widely accepted modern Italian cities that have an Etruscan foundation, though there may have been three separate Etruscan leagues, each composed of twelve cities.”
Excerpted from: Rogerson, Barnaby. Rogerson’s Book of Numbers: The Culture of Numbers–from 1,001 Nights to the Seven Wonders of the World. New York: Picador, 2013.