Place name origins only have little relation to the Roman names (e.g. Chester - 'Deva', Winchester - 'Venta Belgarum' etc.). Many English places derive part of their name from the river upon which they were built, but in the 16th century many English rivers were renamed with back-formations from towns on their banks. Cambridge, perhaps uniquely, illustrates both effects: originally "Grontabricc", a bridge on the Granta, the name became "Cantebruge" and then "Cambrugge", from which the river was renamed Cam. The vast majority of place names in Wales are Welsh by origin, containing elements such as Llan-, Aber-, Pen- etc. Along the south
Venta Icenorum south of present-day Norwich, and a mile or two from the Bronze Age henge at Arminghall. It lies on the River Tas. The embankments of Venta Icenorum can still be seen at Caistor today. The ruins (British National Grid ref TG230034) are in the care of the Norfolk Archaeological Trust and managed by South Norfolk District Council. Venta Icenorum Venta Icenorum, located at modern-day Caistor St Edmund in the English county of Norfolk, was the civitas or capital of the Iceni tribe, who inhabited the flatlands and marshes of that county and are famous for having revolted against Roman rule