Battle of Mount Algidus

San Michele Arcangelo is a Neoclassical-style, Roman Catholic church located Piazza Cesare Ottaviano Augusto, 11, of Velletri, in the province of Rome, in Italy. A church at the site was likely erected by the Lomards over the remains of an ancient temple dedicated to Mars. It has undergone numerous reconstructions. The high altar shelters a Crucifix (1703) by Filippo Zucchetti. Inside is a canvas deicting St Anna by Agostino Carracci, donated in 1626 by the notary Zeffiro Velli.

Velletri (Italian: [velˈleːtri]; Latin: Velitrae; Volscian: Velester) is an Italian comune in the Metropolitan City of Rome, approximately 40 km to the southeast of the city centre, located in the Alban Hills, in the region of Lazio, central Italy. Neighbouring communes are Rocca di Papa, Lariano, Cisterna di Latina, Artena, Aprilia, Nemi, Genzano di Roma, and Lanuvio. Its motto is: Est mihi libertas papalis et imperialis ('Liberty of pope and empire is given to me'). Velletri was an ancient city of the Volsci tribe. Legendarily it came into conflict with the Romans during the reign of Ancus Marcius, the fourth king of Rome; then again in the fifth and fourth centuries BCE, during the early Roman Republic. Velletri was also the home of the Octavii, the paternal family of the first Roman Emperor Augustus. In the Middle Ages, it was one of the few "free cities" in Lazio and central Italy. It was the site of two historic battles in 1744 and 1849. During the Second World War, it was at the centre of fierce fighting between the Germans and the allies in 1944 after the Anglo-American landing at Anzio. Today, Velletri is home to a circuit court and a prison, in addition to several colleges and high schools. It is the terminus of the Rome-Velletri railway, inaugurated by Pius IX in 1863, and is one of the centers the Via Appia Nuova (modern Appian Way) passes through.

San Martino Vescovo is a Roman Catholic church located in the historic center of Velletri, in the province of Rome, in Italy. A church at the site is mentioned in a bull from 1065 from Pope Alexander II. The church was assigned to the Somaschi Fathers in 1616 by Pope Paul V. Over the centuries, the church has undergone reconstruction. Under the Somaschi, it was rebuilt in 1772 to 1778 with the facade completed in 1825. The altarpiece of the Madonna with Child was brought here in 1817 from the abandoned Monastery of Santa Maria dell’Orto.

Velletri Cathedral (Italian: Duomo di Velletri; Cattedrale di San Clemente) is a Roman Catholic cathedral in Velletri in the region of Lazio, Italy, dedicated to Saint Clement, pope and martyr. It is the episcopal seat of the Suburbicarian Diocese of Velletri-Segni.

Banca Popolare del Lazio S.C.p.A. (BP Lazio), is an Italian cooperative bank based in Velletri, Lazio region.

The so-called Roman Castles (Castelli Romani in Italian) are a group of comunes in the Metropolitan City of Rome. They are located a short distance south-east of the city of Rome, at the feet of the Alban Hills, in the territory corresponding to the Old Latium.

Nemi is a town and comune in the Metropolitan City of Rome (central Italy), in the Alban Hills overlooking Lake Nemi, a volcanic crater lake. It is 6 kilometres (4 mi) northwest of Velletri and about 30 kilometres (19 mi) southeast of Rome. The town's name derives from the Latin nemus, or "holy wood". In antiquity the area had no town, but the grove was the site of one of the most famous of Roman cults and temples: the Temple of Diana Nemorensis. In 1514 Marcantonio I Colonna gave to Nemi the "Statuti e Capituli del Castello di Nemi".

The Temple of Diana Nemorensis was an ancient Roman sanctuary erected around 300 BC and dedicated to the goddess Diana. The temple was situated on the northern shore of Lake Nemi, beneath the cliffs of the modern city of Nemi (Latin nemus Aricinum). It was a pilgrimage site on the Italian peninsula. The temple complex covered an area of 45,000 square meters.Historical evidence suggests that worship of Diana at Nemi flourished from at least the 6th century BCE The temple was abandoned at some point in the late Roman Empire period. If still in use by the 4th-century, it would have been closed during the persecution of pagans in the late Roman Empire. Portions of its marbles and decorations were removed. The area of the temple was gradually covered by forest and generally left undisturbed for centuries. Amateur archaeological excavations of the site began in the 1600s.

The Algidus Mons, known in English as Mount Algidus, is the eastern rim of the dormant Alban Volcano in the Alban Hills, about 20 kilometres (12 mi) 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 Mount Algidus. The Via Latina, a road that was strategically advantageous in the military history of Rome, leads to Mount Algidus mountain pass. 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 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.

The Nemi ships were two ships, of different sizes, built under the reign of the Roman emperor Caligula in the 1st century AD on Lake Nemi. Although the purpose of the ships is speculated upon, the larger ship was an elaborate floating palace, which contained quantities of marble, mosaic floors, heating and plumbing, and amenities such as baths. Both ships featured technology thought to have been developed historically later. It has been stated that the emperor was influenced by the lavish lifestyles of the Hellenistic rulers of Syracuse and Ptolemaic Egypt. Recovered from the lake bed in 1929, the ships were destroyed by fire in 1944 during World War II.

Lake Nemi (Italian: Lago di Nemi, Latin: Nemorensis Lacus, also called Diana's Mirror, Latin: Speculum Dianae) is a small circular volcanic lake in the Alban Hills 30 km (19 mi) south of Rome in the Lazio region of Italy. It takes its name from Nemi, the largest town in the area, that overlooks it from a height. It was formed in an ancient volcanic crater created at least 36,000 years ago.The lake is famous for its great sunken Roman ships built under Caligula.

The Alban Hills (Italian: Colli Albani) are the caldera remains of a quiescent volcanic complex in Italy, located 20 km (12 mi) southeast of Rome and about 24 km (15 mi) north of Anzio. The 950 m (3,120 ft) high Monte Cavo forms a highly visible peak the centre of the caldera, but the highest point is Maschio delle Faete approximately 2 km (1.2 mi) to the east of Cavo and 6 m (20 ft) taller. There are subsidiary calderas along the rim of the Alban Hills that contain the lakes Albano and Nemi. The hills are composed of peperino (lapis albanus), a variety of tuff that is useful for construction and provides a mineral-rich substrate for nearby vineyards.