 Many years later, , the Chauci seized an opportunity to expel the Ampsivarii and occupy their lands at the mouth of the River Ems, whereby they gained a border with the Frisians to the west.In AD 47 (and perhaps for some time earlier), the Chauci along with the Frisians were led by a certain Gannascus of the Canninefates.They raided along the then-wealthy coast of Gallia Belgica (i.e., the land south of the Rhine and north of the Rivers Marne and Seine), and the Chauci made inroads into the region that would later become the neighbouring Roman province of Germania Inferior, in the area of the Rhine delta in what is now the southern Netherlands.