The Algidus Mons is the eastern rim of the dormant Alban Volcano in the Alban Hills, about 20 km southeast of Rome, Italy. The ridge is traversed by a narrow crevasse called la Cava d'Aglio. It was the site of the ancient Roman Battle of Mons Algidus.

La Via Latina, a road that was strategically advantageous in the military history of Rome, leads to the Algidus Mons mountain pass. Dionysius of Halicarnassus claimed that a town was founded on the mountain (Dion. Halic. x. 21, xi. 3), but this has not been verified by modern scholarship. Although an extensive fortification lines the Maschio d'Ariano (the hill to the south of the Via Latina), this particular structure was entirely medieval, and therefore did not exist during the time period described by Dionysius. However, some historical topographers have mistakenly included it on maps meant to illustrate Italy during the Western Roman Empire.

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• This article incorporates text from the Encyclopædia Britannica, Eleventh Edition, a publication now in the public domain.

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