Mount Algidus

Mount Algidus ({{langx|la|Algidus Mons}}, "Chilly Mountain") is the eastern rim of the dormant Alban Volcano in the Alban Hills, about {{convert|20|km|mi}} southeast of Rome, Italy. The ridge is traversed by a narrow crevasse called the {{lang|it|Cava d'Aglio}}. It was the site of the ancient Roman Battle of Mount Algidus.

The Via Latina, a road that was strategically advantageous in the military history of Rome, leads to the mountain pass beside Mount Algidus. Dionysius of Halicarnassus claimed that a town was founded on the mountain,Dionysius of Halicarnassus, x. 21 & xi. 3. but this has not been verified by modern scholarship. Although an extensive fortification lines the {{lang|it|Maschio d'Ariano}}, the hill to the south of the Via Latina, this particular structure is entirely medieval and therefore did not exist during the time period described by Dionysius.{{Cite EB1911|wstitle=Algidus Mons|volume=1|page=653}} However, some historical topographers have mistakenly included it on maps meant to illustrate Italy during the Western Roman Empire.