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).
Evidence pertaining to di indigites is rarely found outside Rome and Lavinium, but a fragmentary inscription from Aletrium (modern Alatri, north of Frosinone) records offerings to di Indicites including Fucinus, a local lake-god; Summanus, a god of nocturnal lightning; Fiscellus, otherwise unknown, but perhaps a local mountain god; and the Tempestates, weather deities.
Some notable sites that have fortification walls built in this technique include Norba, Signia, Alatri, Boiano, Circeo, Cosa, Alba Fucens, Palestrina, and Terracina.