 In 54 and 55 , as part of his Gallic Wars, Julius Caesar invaded Great Britain and indications of a Roman settlement have been found to the north of Passage Road and Romano-British pottery has been found in the area, including along the river bank at Arlingham Warth, indicating that Arlingham was probably a wetland settlement of Roman Britain, possibly centred around iron workings.Numerous dense concentrations of primitive iron-making bloomery slag are distributed over the arable land south of Passage Pill.