Matterhorn. The Matterhorn is a mountain of the Alps, straddling the main watershed and border between Switzerland and Italy. It is a large, near-symmetrical pyramidal peak in the extended Monte Rosa area of the Pennine Alps, whose summit is 4,478 metres high, making it one of the highest summits in the Alps and Europe. The four steep faces, rising above the surrounding glaciers, face the four compass points and are split by the Hörnli, Furggen, Leone / Lion, and Zmutt ridges. The mountain overlooks the Swiss town of Zermatt, in the canton of Valais, to the north-east and the Italian town of Breuil-Cervinia in the Aosta Valley to the south. Just east of the Matterhorn is Theodul Pass, the main passage between the two valleys on its north and south sides, and a trade route since the Roman Era. The Matterhorn was studied by Horace-Bénédict de Saussure in the late eighteenth century, who was followed by other renowned naturalists and artists, such as John Ruskin, in the 18th century. It remained unclimbed after most of the other great Alpine peaks had been attained and became the subject of an international competition for the summit. The first ascent of the Matterhorn was in 1865 from Zermatt by a party led by Edward Whymper; it ended when four of its seven members fell to their deaths on the descent. This disaster, later portrayed in several films, marked the end of the golden age of alpinism. The north face was not climbed until 1931 and is among the three biggest north faces of the Alps, known as The Trilogy. The west face, which is the highest of the Matterhorn's four faces, was completely climbed only in 1962. It is estimated that over 500 alpinists have died on the Matterhorn, making it one of the deadliest peaks in the world. The Matterhorn is mainly composed of gneisses from the Dent Blanche nappe, lying over ophiolites and sedimentary rocks of the Penninic nappes. The mountain's current shape is the result of cirque erosion due to multiple glaciers diverging from the peak, such as the Matterhorn Glacier at the base of the north face. Sometimes referred to as the Mountain of Mountains, the Matterhorn has become an iconic emblem of the Alps in general. Since the end of the 19th century, when railways were built in the area, the mountain has attracted increasing numbers of visitors and climbers. Each year, numerous mountaineers try to climb the Matterhorn from the Hörnli Hut via the northeast Hörnli ridge, the most popular route to the summit. Many trekkers also undertake the 10-day-long circuit around the mountain. The Matterhorn has been part of the Swiss Federal Inventory of Natural Monuments since 1983. The German name Matterhorn is named for Mattertal and Zermatt. In the Schalbetter map, printed by Sebastian Münster in 1545, the valley is labelled Mattertal, but the mountain has the Latin name Mons Silvius and the German name Augstalberg, Augstal being the German name of Aosta Valley. The 1548 map by Johannes Stumpf gives only Mons Silvius. The French name Cervin, from which the Italian term Cervino derives, stems from the Latin Mons Silvanus, where silva means forest; this was corrupted to Selvin and then Servin. The change of the first letter s to c is attributed to Horace Bénédict de Saussure, who thought the word was related to deer. Josias Simler hypothesized in De Alpibus Commentarius that the name Mons Silvius was readopted by T. G. Farinetti: Silvius was probably a Roman leader who sojourned with his legions in the land of the Salassi and the Seduni, and perhaps crossed the Theodul Pass between these two places. This Silvius may have been that same Servius Galba whom Caesar charged with the opening up of the Alpine passes, which from that time onward traders have been wanting to cross with great danger and grave difficulty. Servius Galba, in order to carry out Caesar's orders, came with his legions from Allobroges to Octodurum in the Valais, and pitched his camp there.