In 1966 under the Byzantine and Medieval fortress the traces of a Punic citadel were recognized.
See:
- J. Ferron, sv. Clupea: in Dictionnaire d'Histoire et de Géographie ecclésiastiques, vol. XIII, Paris 1956, coll. 174-176
- http://www.treccani.it/enciclopedia/clupea_%28Enciclopedia-dell%27-Arte-Antica%29/
