Medes

"When we speak of Medes and Persians, we must not lose sight of a historical perspective. In all likelihood, the ethnic groups of the Medes and the Persians that were settling the historical lands in the 8th century B.C. must already have been the result of processes of assimilation of heterogeneous ethnic, linguistic and cultural elements."

"The Aryas who became part of the ethnic groups of the Medes and the Persians were none other than western branches of the Avestan Airyas who, in their westward migrations, had taken with them the name Aryan and so had extended, in a way, the boundaries of Ariana proper."