Question: This group encompassed a federation of Alpine tribes, including the Calucones, for about 6 centuries starting around 500 BC.  
Sentence (from "Rhaetian people"): The Raeti (spelling variants: "Rhaeti", "Rheti" or "Rhaetii"; Ancient Greek: "Ῥαιτοί": transcription "Rhaitoí") were a confederation of Alpine tribes, whose language and culture may have derived, at least in part, from the Etruscans.
Relevant evidence: Yes