Rhaetia

Raetia

 or Rhaetia

Ancient Roman province south of the Danube River. It comprised parts of present-day Austria, Switzerland, and Germany. Its native inhabitants were probably of mixed Illyrian and Celtic descent. Conquered by Rome in 15 BC, it became an important part of the empire for its position on the highways between Italy and the Danube and between Gaul and the Balkans. Because it was a frontier province, its boundaries shifted when German tribes encroached; in the 1st century AD, the northern boundary extended to the Neckar River, but in the 3rd century the western and northern boundaries were pulled back. By 450, Rome controlled only the alpine regions.

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Rhaetia

an Alpine province of ancient Rome including parts of present-day Tyrol and E Switzerland

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Rhaetia 

a Roman province formed in 15 B.C. in the interfluve between the Rhine and the Danube in the Alps. Rhaetia was inhabited mainly by Rhaetian and Vindelician tribes. During the reign of Emperor Diocletian in the third century A.D., Rhaetia was divided into two provinces—Rhaetia Prima in the south and Rhaetia Secunda in the north. In the middle of the fifth century Rhaetia was conquered by the Alamanni, Suevi, and other Germanic tribes.