History of Workington established on the north bank of the mouth of the River Derwent, near present-day Siddick Pond and Northside. Another fort or watchtower would have been on How Michael to the south side of the river, near present-day Chapel Bank. In 122, the Romans begin building Hadrian's Wall from Bowness on the Solway Firth to Wallsend on the North Sea. The discovery of a Roman fort around the parish church in Moresby to the south, and fortifications to the north at Risehow (Flimby), Maryport and Crosscannonby support the argument that the coastal wall extended down the whole Solway coast and formed
Edderside the second century AD, and there are Roman remains in the vicinity. This section of the west Cumbrian coastline was fortified by the Romans during this period, as a series of milefortlets were constructed to guard the Solway coast beyond the western end of Hadrian's Wall. The remains of Milefortlet 17 are located at nearby Dubmill Point. Following the dissolution of the monasteries in the 1530s, records from Holmcultram Abbey in Abbeytown showed Edderside paid an annual tithe of six large baskets of meal. Also during the 16th century, raids by Scots across the Solway Firth were still relatively common.