 They were raiding the coasts of Roman Belgica in AD 41, long before they participated in further raids of the same coasts under Gannascus in AD 47.It is likely that their raiding was endemic over the years, as the few surviving accounts probably do not reflect all occurrences.Tacitus describes the Chauci as 'peaceful' in his "Germania" (AD 98), but this is in a passage describing the non-coastal, inland Chauci, whereas sea raiders are necessarily a coastal people.