That is a beautiful map. Please remind us who brought down the Roman Empire??? I recall those to the north. During the crusades those same people leveled Constantinople to the ground and made it an easy prey for the Ottomans.The Romans/ Latins were Indo-Europeans, so had a common origin with other Indo-European peoples like the Greeks, Celts, Germans etc in eastern Europe. Italic and Celtic languages are considered to be particularly closely related. This might reflect a common origin in the late Bronze Age Urnfield culture.