The name derives from the Aromanians or Vlachs, a chiefly transhumant ethnic group that lives in several mountainous areas of the Balkans, descended from ancient Romance-speaking populations mixed with the people from the Barbarian Invasions of Late Antiquity. In the broadest sense, both Greek and Western sources of the later Middle Ages—like the French, Italian, and Aragonese versions of the Chronicle of the Morea, or the chroniclers Ramon Muntaner and Marino Sanudo Torsello—used Vlachia or similar names (Blaquie, Blaquia, Val[l]achia) to refer to all of Thessaly, from the Pindus mountains in the west to the Aegean Sea in the east, and from the area of Mount Olympus and Servia in the north to the towns of Zetouni (Lamia) and Neopatras (Ypati) in the south.