During post glacial times relative land- and sea-levels have changed continuously but inconsistently, for reasons which are complex and numerous. Relevant studies can be found ‘among the works of astronomers, geophysicists, geologists, geomor-phologists, hydrographers, oceanographers, climatologists, biologists, archaeologists, historians, land surveyors, civil engineers’ and even ‘etc’. Further investigations ‘to identify and quantify the processes of sea-level change by producing detailed local histories that can be analysed and correlated’ have been undertaken by geographers: their approach involves the radiocarbon analysis of organic samples, but the difficulties encountered in fixing the exact position of these, determining the actual tidal level which they represent and assessing the errors associated with the dating method are recognised. It might, therefore, be expected that archaeological evidence from the Roman period, to which remains of major structures erected at locations on coasts and estuaries can be assigned with some certainty from the associated epigraphic, numismatic or ceramic finds, would make an important contribution to studies on sea-level changes. The findings, however, have often been ignored or repudiated, especially when they conflict with the deductions offered by researchers in other disciplines.