Menapii
The Menapii were a Belgic tribe in the 1st century BC. Their territory corresponds more or less with the region around the modern city of Gent (the modern Belgian province of Oost-Vlaanderen) but extended up to the Schelde estuary. Their civitas was Cassel (northern France), near Terouanne. Their language was most probably germanic.
Neighbours were:
They resisted strongly Caius Julius Caesar. He even tried to genocide them. Later, they served in a few Menapian cohorts, attested in Britain.
A tribe called Menapii is also attested as living in south-eastern and later north-western Ireland.