The Six-Year Priority Programme (SPP) 1630 "Ports from the Roman Imperial Period to the Middle Ages", funded by the German Research Foundation (DFG), led to an interdisciplinary and networked cooperation between several project groups - Rhine, North Sea, Baltic Sea and inland ports - with research on early medieval glass finds at ports. External institutions and persons dedicated to research on the production and distribution of glass in the early Middle Ages were also included in the exchange t ...