Swiss plateau in the context of "Lake Morat"

The Helvetii (Ancient Greek: Ἐλουήτιοι, Latin: Helvētiī [hɛɫˈweːti.iː], Gaulish: *Heluētī), anglicized as Helvetians, were a Celtic tribe or tribal confederation occupying most of the Swiss plateau at the time of their contact with the Roman Republic in the 1st century BC. According to Julius Caesar, the Helvetians were divided into four subgroups or pagi. Of these, Caesar names only the Verbigeni and the Tigurini, while Posidonius mentions the Tigurini and the Tougeni (Τωυγενοί). They feature prominently in the Commentaries on the Gallic War, with their failed migration attempt to southwestern Gaul (58 BC) serving as a catalyst for Caesar's conquest of Gaul.

The Helvetians were subjugated after 52 BC, and under Augustus, Celtic oppida, such as Vindonissa or Basilea, were re-purposed as garrisons. In AD 68, a Helvetian uprising was crushed by Aulus Caecina Alienus.The Swiss plateau was at first incorporated into the Roman province of Gallia Belgica (22 BC), later into Germania Superior (AD 83).The Helvetians, like the rest of Gaul, were largely Romanized by the 2nd century. In the later 3rd century, Roman control over the region waned, and the Swiss plateau was exposed to the invading Alemanni. The Alemanni and Burgundians established permanent settlements in the Swiss plateau in the 5th and 6th centuries, resulting in the early medieval territories of Alemannia (Swabia) and Upper Burgundy. The Helvetii were largely assimilated by their new rulers, contributing to the ethnogenesis of modern Swiss people.

Brugg (sometimes written as Brugg AG in order to distinguish it from other Bruggs) is a Swiss municipality and a town in the canton of Aargau and is the seat of the district of the same name. The town is located at the confluence of the Aare, Reuss, and Limmat, with the Aare flowing through its medieval part. It is located approximately 16 kilometers (9.9 mi) from the cantonal capital of Aarau; 28 kilometers (17 mi) from Zürich; and about 45 kilometers (28 mi) from Basel.

Brugg is the Swiss German term for bridge (German: Brücke). This is an allusion to the purpose of the medieval town's establishment under the Habsburgs, as the town is located at the narrowest point on the Aare in the Swiss midlands. The Habsburgs’ oldest known residence is located in the neighborhood of Altenburg, which had previously been an independent community. Prior to their relocation to Austria, Brugg was the center of the Habsburgs' territory. Between 1415 and Napoleon’s invasion in 1798, Brugg was a subject territory of Bern. Since then it has belonged to the canton of Aargau.

The Napf is a mountain on the border between the Swiss cantons of Bern and Lucerne. With an altitude of 1,408 meters (4,619 ft), it is the summit of the Napfgebiet (Napf region), the hilly region lying between Bern and Lucerne. It is counted geologically as part of the Swiss plateau, although it is sometimes considered part of the Emmental Alps. The region is bounded by the Emmental to the south-west and the Entlebuch to the east. The region is traversed by the Brünig-Napf-Reuss line.

The peak is surrounded by steep hills that are a patchwork of evergreen forests and small mountain farms. Nearby towns include Romoos, Doppleschwand, Michlischwand, Luthern, and Menzberg.

Aarau (Swiss Standard German: [ˈaːraʊ], Alemannic German pronunciation: [ˈɑːræu̯]) is a town, a municipality, and the capital of the northern Swiss canton of Aargau. The town is also the capital of the district of Aarau. It is German-speaking and predominantly Protestant. Aarau is situated on the Swiss plateau, in the valley of the Aare, on the river's right bank, and at the southern foot of the Jura Mountains, and is west of Zurich, 58 kilometres (36 miles) south of Basel and 65 kilometres (40 miles) northeast of Bern. The municipality borders directly on the canton of Solothurn to the west. It is the largest town in Aargau. At the beginning of 2010 Rohr became a district of Aarau.

The official language of Aarau is (the Swiss variety of Standard) German, but the main spoken language is the local variant of the Alemannic Swiss German dialect.