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Beneath the housing estates of Gaywood within the urban reach of modern King?s Lynn lies a former saltmarsh ? Gaywood?s North Marsh ? which once played an important role in the economic and physical development of this dynamic coastal and estuarine landscape. Focused on the eastern side of the Wash and to the north of an ancient inlet known as the Lyn, this marshland was rich in salt or ?white gold?, gathered from the brine-saturated muds and processed using the post-Roman technique of sand-washing or sleeching. Often the only traces left behind of this once important coastal industry are the denuded hillocks or mounds representing the accumulated waste deposits associated with salt-winning, dozens of which have been mapped in this area. An opportunity to investigate several of these saltern mounds was prompted by the Lynnsport and Greenpark Avenue Primary School developments, leading to a three-year scheme of topographical survey, evaluation trenching and targeted excavation. 0Building on previous work by OA East at Marsh Lane, this volume provides a synthetic overview of the salt-making evidence utilising a suite of scientific techniques underpinned by historical research and Bayesian modelling to reconstruct the saltmarsh environment and how this changed over time. One of the key results has been firmly to establish that the sand-washing method was in use on the east coast of England as early as the Middle Saxon period (8th to 9th century), continuing into the medieval period and beyond in some places. A possible association with the Middle Saxon ?productive? site at Bawsey is explored, as is the more definite connection with the East Anglian bishops and bishops of Norwich, who once owned this land. Linked to this are the provision of labour, methods of transport and access to fuel.