Illyrians

Context: Even before the advent of post-modernism, scholars recognized a "difficulty in producing a single theory on the ethnogenesis of the Illyrians" given their heterogeneous nature. Modern scholarship is unable to refer to the Illyrians as a unique and compact people and agrees that they were a sum of ill-defined communities without common origins that never merged to a single ethnic entity.  On the other hand, some past Pan-Illyrian theories have been dismissed by scholars, based as they were on racialistic notions of Nordicism and Aryanism. The specific theories have found little archaeological corroboration, as no convincing evidence for significant migratory movements from the Luzatian culture into the west Balkans have ever been found. Rather, archaeologists from the former Yugoslavia highlighted the continuity between the Bronze and succeeding Iron Age (especially in regions such as Donja Dolina, central Bosnia-Glasinac, and northern Albania (Mat river basin)), ultimately developing the so-called "autochthonous theory" of Illyrian genesis. The "autochthonous" model was most elaborated upon by Alojz Benac and B. Covic. They argued (following the "Kurgan hypothesis") that the 'proto-Illyrians' had arrived much earlier, during the Bronze Age as nomadic Indo-Europeans from the steppe. From that point, there was a gradual Illyrianization of the western Balkans leading to historic Illyrians, with no early Iron Age migration from northern Europe. He did not deny a minor cultural impact from the northern Urnfield cultures, however "these movements had neither a profound influence on the stability.. of the Balkans, nor did they affect the ethnogenesis of the Illyrian ethnos".  Aleksandar Stipcevic raised concerns regarding Benac's all-encompassing scenario of autochthonous ethnogenesis. He points out "can one negate the participation of the bearers of the field-urn culture in the ethnogenesis of the Illyrian tribes who lived in present-day Slovenia and Croatia" or "Hellenistic and Mediterranean influences on southern Illyrians and Liburnians?". He concludes that Benac's model is only applicable to the Illyrian groups in Bosnia, western Serbia and a part of Dalmatia, where there had indeed been a settlement continuity and 'native' progression of pottery sequences since the Bronze Age. Following prevailing trends in discourse on identity in Iron Age Europe, current anthropological perspectives reject older theories of a longue duree (long term) ethnogenesis of Illyrians, even where 'archaeological continuity' can be demonstrated to Bronze Age times. They rather see the emergence of historic Illyrians tribes as a more recent phenomenon - just prior to their first attestation.  The impetus behind the emergence of larger regional groups, such as "Iapodes", "Liburnians", "Pannonians" etc., is traced to increased contacts with the Mediterranean and La Tene 'global worlds'. This catalyzed "the development of more complex political institutions and the increase in differences between individual communities". Emerging local elites selectively adopted either La Tene or Hellenistic and, later, Roman cultural templates "in order to legitimise and strengthen domination within their communities. They were competing fiercely through either alliance or conflict and resistance to Roman expansion. Thus, they established more complex political alliances, which convinced (Greco-Roman) sources to see them as 'ethnic' identities." Contemporary perspectives again highlight that the term "Illyrian" was a 'catch-all' exonym used by the Greeks and Romans to denote diverse communities beyond Epirus and Macedonia. Each was differentially conditioned by specific local cultural, ecological and economic factors; none of which fall into a compact, unitary "Illyrian" narrative. CANNOTANSWER

Question: Where were Mediterranean and La Tene located?
Answer: there was a gradual Illyrianization of the western Balkans