Cohors prima Raetorum ("1st Cohort of Raeti") was a Roman auxiliary infantry regiment. It is named after the Raeti, a designation probably given to some Alpine tribes, which were part of the eponymous province Raetia et , later called simply Raetia. It comprised much of modern Switzerland, western Austria and Germany south of the river Danube. The Raeti originally spoke a non Indo-European language that seems related to Etruscan. However, by the time their territory was annexed by Rome under founder-emperor Augustus (16 BC), they had become largely Celtic-speaking through contact with neighbouring peoples such as the Vindelici. Finally, during the centuries of Roman rule, they became Latin speakers: their distinctive provincial patois survives today in the form of the Rhaeto-Romance langua