Porta Sempione is a city gate of Milan. The gate is marked by a landmark triumphal arch called Arco della Pace ('Arch of Peace'), dating back to the 19th century, although its origins can be traced back to a gate of the Roman walls of Milan.
A gate that roughly corresponds to modern Porta Sempione was already part of Roman walls of Milan. At the time, the gate was meant to control an important road leading to what is now Castelseprio. Very little remains of the original Roman structure; some Roman tombstones that used to be placed by the outer side of the walls have been employed in the construction of later buildings such as the Basilica of Saint Simplician.
In the Middle Ages, part of the Roman walls in the Porta Sempione area were adapted as part of the new walls. The gate itself was moved north, in a place that is now occupied by the Sforza Castle. The Castle itself was completed in the 15th Century, under Duke Filippo Maria Visconti, and the gate itself became part of the Castle.
In 1807, under the Napoleonic rule, the Arch of Peace was built by architect Luigi Cagnola. This new gate marked the place where the new Strada del Sempione entered Milan. This road, which is still in use today, connects Milan to Paris through the Simplon Pass crossing the Alps. At the time, the gate was still called 'Porta Giovia'. When the Napoleonic Kingdom of Italy fell and Milan was conquered by the Austrian Empire, the gate was not yet completed, and the construction was abandoned for a while.
The construction of the Arch was resumed, again by Cagnola, in 1826, for Emperor Francis II, who dedicated the monument to the 1815 Congress of Vienna. When Cagnola died in 1833, his project was taken over by Francesco Londonio and Francesco Peverelli, who brought it to completion in 1838.
The gate was the scene of several prominent events in the Milanese history of the 19th century. On 22 March 1848, the Austrian army led by marshal Josef Radetzky escaped from Milan through Porta Giovia after being defeated in the Five Days of Milan rebellion. On 8 June 1859, four days after the Battle of Magenta, Napoleon III and Victor Emmanuel II of Italy triumphally entered Milan through the gate.
Porta Sempione is neoclassical triumphal arch, 25 m high and 24 m wide, decorated with a number of bas-reliefs, statues, and corinthian columns. Many of such decorations, especially bas-reliefs, are dedicated to major events in the history of Italy and Europe, such as the Battle of Leipzig, the foundation of the Kingdom of Lombardy–Venetia, the Congress of Vienna. Other decorations have classical mythology subjects such as Mars, Ceres, Minerva, Apollo, and Victoria-Nike. There are also a group of statues that are allegories of major rivers in North Italy such as the Po, the Adigeand the Ticino. At the sides of the Arch of Peace there are two minor rectangular buildings that used to be the customs office.
References:Sigmaringen Castle was first mentioned in the year 1077 in the chronicles of Petershausen monastery. The oldest parts of the castle are concealed beneath the alterations made during the 17th and the 19th centuries. The secret of the earliest settlement built on this defendable rock will never be fully revealed: large-scale excavation work would be necessary, which the extensive land development renders impossible. Judging from the many Roman remains unearthed in the area around Sigmaringen, the 12th century keep known as the 'Roman Tower' could be traced back to a Roman predecessor.
The castle remains that have been preserved (gate, great hall and keep) date back to the Staufer period around 1200. The castle remains were integrated into subsequent buildings. The foundations of the castle buildings are to a large extent identical to the surrounding castle wall.
These remains give us a good idea of how the castle might have looked during the 12th century.