This volume is the result of a conference, which was held from June 14 to 15, 2012 at the event centre Schuttkasten in Klement, Lower Austria. The conference was attended by around 40 researchers from eight countries: Austria, Slovakia, the Czech Republic, Poland, Slovenia, Croatia, Hungary and Germany. The thematic focus of the conference contributions was the nature of contacts and relations between the settlement areas of the La Tene culture, which are associated with the Celtic tribes of the Boii and Taurisci on the basis of numismatic and written sources. The Taurisci are historically and archaeologically well documented and generally acknowledged; the term "Boii", however, has always sparked fierce debate. "Boii" is here understood as a technical term for a specific territory (Bohemia, Moravia, southern Poland, northeastern Austria and southwestern Slovakia), which is connected by the gold-based "Boii" monetary system. Fourteen written contributions were obtained for this volume. The paradigm shifts in Iron Age archaeology and the veritable explosion of new archaeological materials and find contexts (coins, fibulae, Knotenringe, architecture and settlement features) have found their expression in this volume. New insights into the relationship between the area of Boii coinage and settlement areas of the Norici, Taurisci and Scordisci are presented.