The conference »Seasides of Byzantium. Harbours and Anchorages of a Mediterranean Empire«, from which the papers collected in the present volume emerged, took place in Athens in 2017 as part of a cooperation between the DFG-funded Special Research Programme (SPP-1630) »Harbours from the Roman Period to the Middle Ages« and the National Hellenic Research Foundation. It united historians, archaeologists and geoarchaeologists to explore harbours and anchorages as core maritime infrastructure to the Late Roman and Byzantine Empire.