Raetia Prima

[1] In the first half of the first century AD, the province of Raetia was created, covering the Alpine region between the Danube and the Inn River, modern Switzerland south of the Bodensee and the northern Tyrol, which had been brought under Roman control in 15 BC.

Both provinces belonged to the Diocese of Italy and were under the control of a single military commander, the Dux Raetiae primae et secundae [de].

The residences of these two officials, Curia Raetorum (modern Chur) and Augusta Vindelicorum [de] (Augsburg), are the source of the later German language terms: Churrätien and Vindelicien.

[3] Even after the Fall of the Western Roman Empire in 476 AD, the political connection of Rhaetia Prima with Italy survived to some extent.

[6] When the Ostrogoths lost that war, Theudebert was able to bring the rest of Raetia Prima including the militarily and economically important Bündner pass under his control.