The question of the tradition continuity is of fundamental importance when reconstructing multilingual communication spaces. It has to be dealt with in an interdisciplinary way for the purposes of a data-driven, inductive approach. But even with combined efforts or several discplines it would not be reasonable to expect a large number of answers regarding the Pre-Roman substrata of the Alpine region. However, the starting point regarding the Romance substratum in the nowadays German- and Slowenian-speaking subareas is much better. The language shift from Romance to German is absolutely a historical constant, that can even be observed currently in the Grisons. The process starts already with the fall of the Roman infrastructure (in 476); the period which follows immediately thereafter is of most interest for linguistic history. However, it is extremely sparsely documented in writing so that the cooperation with other historic subjects, especially with archaeology, is imperative. Although there are still big research gaps, there is at least the work of Weindauer 2014, which studies the archaeological and onomastic sources (6th-8th century) of southern Upper Bavaria, the Salzburg area and the Tyrolean Inntal. Hence, one can exclude a longer, fondamental interruption of settlement between the Roman era and the times of the Bajuwaren ("eine längere, grundlegende Siedlungsunterbrechung zwischen Römer- und Bajuwarenzeit", Weindauer 2014, 248) as all evidence is in favour of a fluid transition of the settlement structure from the Late Antiquity to the Early Middle Ages ("einen fließenden Übergang der Besiedlungsstruktur von der Spätantike zum Frühmittelalter", Weindauer 2014, 248). Nevertheless, a gradual difference between the mentioned areas persists regarding the empirical consolidation: "Was bezüglich des Zusammenhangs spätantiker und frühmittelalterlicher Fundstellen für das oberbayerische Alpenvorland noch überwiegend theoretisch galt {...}, findet in den österreichischen Gebieten seine nachweisliche Bestätigung: Die frühmittelalterlichen Ortsgründungen des 6. Jhs. orientieren sich fast ausschließlich an spätrömischer Infrastruktur bzw. – soweit noch vorhanden – an der romanischen Siedlungsstruktur." (Weindauer 2014, 257; translation: What has been valid still mainly theoretically for the foothills of the Alps of southern Upper Bavaria regarding the link between places of discoveries from the Late Antiquity and the Early Middle Ages {...}, is confirmed by the Austrian areas: The Early Middle Ages foundings of places )