place for transports and military (the Swiss Réduit for instance). Just southeast of the culminating point of the Gotthard Pass, at an elevation of about 2,090 metres above sea level, are several lakes. The largest is named Lago della Piazza and has a surface of 3.94 hectares. South of Lago della Piazza are the Hospice () and National Museum, as well as a hotel and restaurants. Another official road sign displaying an elevation of lies there. A few kilometres away and slightly above the Gotthard Pass are found two large dams and artificial lakes: Lago di Lucendro at the foot of Pizzo Lucendro and Lago della Sella at the foot of Pizzo Centrale. They are respectively part of the Reuss and Ticino basin, although both are located within the canton of Ticino. History Though the pass was locally known in antiquity, it was not generally used until the early 13th century because travel involved fording the turbulent Reuss, swollen with snowmelt during the early summer, in the narrow steep-sided Schöllenen Gorge, below Andermatt. The first wooden bridge across Schöllenen Gorge was built around 1220, and in the following years the pass rapidly gained in importance. The bridge permitted traffic to follow the Reuss to its headwaters and over the saddle at the top—a continental divide between the Rhine, which flows into the North Sea and the river Ticino towards Milan, which after leaving Switzerland flows into the Po and ultimately into the Adriatic Sea. The Gotthard Pass was formerly known as Monte Tremolo (its southern slope is still known as Val Tremola). A chapel dedicated to Saint Gotthard of Hildesheim (died in 1038, canonized 1131), who was considered the patron saint of mountain passes, was built on the southern slope of the pass and consecrated by the archbishop of Milan, Enrico da Settala, in 1230. The pass soon became known after the saint, by as early as 1236. The opening of the Schöllenen Gorge for traffic was an important factor in the original Swiss Confederacy. The three regions of Uri, Schwyz and Unterwalden (the Waldstätten or "forest communities") gained imperial immediacy under the Hohenstaufen emperors still in the first half of the 13th century. An important aspect of the early confederacy, expressed in the Pfaffenbrief of 1370, was the guarantee of peace along the road from Zürich to the Gotthard Pass. The Swiss also had an interest in extending their