The process of ethnic identification is a major driving force in cultural as well as political history, and this is valid also for the organization of communities and the construction of civilizations in antiquity. In the European context, language has always been a prime marker of ethnic self-awareness, and of boundary-marking vis-à-vis other ethnic groups. Against the background of a general assessment of ethnicity and related concepts, the functioning of ethnic identity is addressed for a wide array of significant ethnic issues, and these include the interactions, cultural exchange, and linguistic fusion between Paleo-Europeans and Indo-Europeans, conceptualizations of Greekness and Roman-ness, the impact of Etruscan culture and language on Roman civilization, processes of Romanization in the western Mediterranean, ethnic interactions in seafaring and trade, and the instrumentalization of ethnicity in myth-making, particularly in myths of origins.