The Old Swiss Confederacy began as a late medieval alliance between the communities of the valleys in the Central Alps, at the time part of the Holy Roman Empire, to facilitate the management of common interests such as free trade and to ensure the peace along the important trade routes through the mountains. The Hohenstaufen emperors had granted these valleys reichsfrei status in the early 13th century. As reichsfrei regions, the cantons of Uri, Schwyz, and Unterwalden were under the direct authority of the emperor without any intermediate liege lords and thus were largely autonomous.
Silenen is a municipality in the canton of Uri in Switzerland.
The Castelli di Cannero are three rocky islets of Lake Maggiore in northern Italy. They are located off the shoreline of Cannero Riviera while administratively forming part of the Comune of Cannobio. They are known as castelli, or castles, in recognition of the ruined ancient fortifications which are found on two of them. They are all that remains of the Rocca Vitaliana fortress built between 1519 and 1521 by Ludovico Borromeo, who gave it this name in honour of an illustrious ancestor.
The Battle of Arbedo was fought on 30 June 1422 between the Duchy of Milan and the Swiss Confederation, and ended with a Milanese victory.
The Castles of Bellinzona are a group of fortifications located around the town of Bellinzona, the capital of the Swiss canton of Ticino. Situated on the Alpine foothills, the group is composed of fortified walls and three castles named Castelgrande, Montebello and Sasso Corbaro. Castelgrande is located on a rocky peak overlooking the valley, with a series of walls that protect the old city and connect to Montebello. Sasso Corbaro, the highest of the three castles, is located on an isolated rocky promontory south-east of the other two. The Castles of Bellinzona with their defensive walls have been an UNESCO World Heritage Site since 2000.
Crèvecœur Castle is a ruined castle in Belgium. The ruins of the Château de Crèvecœur are located in Bouvignes-sur-Meuse, part of the Belgian city of Dinant, province of Namur, Wallonia. The castle is owned by the Walloon Region. The ruin field can be visited freely all year.
Marmels Castle German: Burg Marmels is a ruined castle in the municipality of Marmorera in the district of Albula in the canton of Graubünden in Switzerland.
The siege of Godesberg, 18 November – 17 December 1583, was the first major siege of the Cologne War (1583–1589). Seeking to wrest control of an important fortification, Bavarian and mercenary soldiers surrounded the Godesberg, and the village then of the same name, now Bad Godesberg, located at its foot. On top of the mountain sat a formidable fortress, similarly named Godesburg, built in the early 13th century during a contest over the election of two competing archbishops.
Calenberg Castle was a medieval lowland castle in central Germany, near Schulenburg in the borough of Pattensen, 13 kilometres (8.1 mi) west of the city of Hildesheim. It was built as a water castle in 1292 by the Welf duke, Otto the Strict, in der Leine river meadows between two branches of the Leine river on the southern part of the chalk marl hill of the Calenberg. At the start of the 16th century it was converted into a fort (Feste). In the 15th century, Fort Calenberg gave its name to the Welf Principality of Calenberg. Following the Thirty Years' War it lost its military importance and was slighted. Today it is a ruin with underground vaults that are surrounded by high ramparts.
Frohberg Castle is a medieval castle ruin in the Swiss municipality of Aesch in the canton of canton of Basel-Land.
Attinghausen Castle is a ruined medieval castle in the municipality of Attinghausen in the canton of Uri in Switzerland. It is a Swiss heritage site of national significance.
Meierturm is a medieval tower in the municipality of Silenen in the canton of Uri in Switzerland. It is a Swiss heritage site of national significance.
Seedorf Castle is a medieval castle ruin in the municipality of Seedorf in the canton of Uri in Switzerland. It is near the school complex of Seedorf and across the street from the newer castle of Apro.
Fracstein Castle is a castle in the municipality of Seewis im Prättigau of the Canton of Graubünden in Switzerland. It is a Swiss heritage site of national significance.
Dough Castle is a ruined tower house at Lahinch in County Clare, western Ireland. It was established by the O'Conors in the early 14th century, but nothing remains of the original structures.
The Royal Palace of Werla is located near Werlaburgdorf in Lower Saxony. The grounds of the royal palace cover about 20 hectares rising atop Kreuzberg hill, a 17 m high natural plateau overlooking the Oker river. In the Early Middle Ages the palace was an important place in the Holy Roman Empire, serving as an important base for the Ottonians in the 10th century in particular. Although it subsequently lost its political significance to the newly established Imperial Palace of Goslar at Rammelsberg, it developed into an independent settlement with a busy industrial quarter. In the 14th century it fell into ruin and was completely unknown until its rediscovery in the 18th century. The core fortress in particular was thoroughly excavated in the 20th century. Excavations carried out since 2007 have brought new understanding to the hitherto largely unexplored outworks. Since 2010 the palace complex with foundation and enceinte, as well as earthworks, has been partially reconstructed and is now open to the public as the Archäologie- und Landschaftspark Kaiserpfalz Werla.
The Hohenburg is a ruined medieval castle near Lenggries in Bavaria, Germany. Once a dominating centre of power in the region, it was destroyed by fire on 21 July 1717.
Schaaken Castle is a ruined castle originally built for the Teutonic Knights, in Nekrasovo, Kaliningrad Oblast, Russia. It was extensively altered in the 19th century and has become a ruin since World War II.
Bernau Castle is a ruined castle in the municipality of Leibstadt in the canton of Aargau in Switzerland. It was mostly destroyed in a fire in July 1844 leaving only a few ruined walls still visible.
Limberg Castle is a ruined hill castle on the 190-metre-high Limberg in the Wiehen Hills. It is located near the village of Börninghausen in the borough of Preußisch Oldendorf in the East Westphalian county of Minden-Lübbecke in the German state of North Rhine-Westphalia.
