It is speculated that, at the foot of the hill on which the city stands, there was the so-called Maritime Circle, where the Hernican towns of "Aletrium" (Alatri), "Capitulum" (Piglio), "Verulae" (Veroli), and "Ferentinum" (Ferentino) confederated under the aegis of "Anagnia" (Anagni).
Od teh spisov je edini ohranjen "Liber linteus".