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The Romans also referred to the citadel of other cities as an arx (plural arces). Excavations in Cosa, Tuscany, conducted in 1948–54 and 1965–72, uncovered the settlement's arx. Frank E. Brown and his team studied the site extensively when they began the Cosa excavations in 1948. The citadel was a fortified hill on which were built several temples, including the so-called "capitolium" of Cosa.
In Lavinium, south of Rome, Castello Borghese is thought to be the possible site of the Roman-era arx constructed in the port city.
The arx of Londinium was located in the northwest corner of the present-day City of London, south of Cripplegate. It was constructed around 120 and dismantled around the time of Diocletian.
la collina dove sarebbe poi sorto il rione Castellone costituiva l’arx (o arce) della città antica di Formia
La ” cavea ” del Teatro , come quasi tutti i teatri romani, fu appoggiata dai costruttori sul declivio del colle di Castellone disposto in modo che gli spettatori guardassero a sud verso il mare e sicuramente protetti da un apposito “velarium” .