English summary: This is the first of three accompanying volumes to an exhibition by the Romisch-Germanisches Zentralmuseum Mainz from 17 March to 11 November 2018 at Schallaburg (Lower Austria) on the equally diverse and variable relations between the Latin West and the Byzantine Empire. The three volumes will bring together contributions by renowned scientists with a focus on archaeology, art history, philology and history. The multi-layered ensemble...