From Stamps of the World
Aardenburg is a small city (population as of 2008: 2,438) close to the Dutch border with Belgium. It is part of the Sluis Municipality, located in the province of Zeeland in the Netherlands. Its medieval name was Rodenburgh (Red Castle). Archeologists have found proof of settlement as early as 4500 BC. The site was a small Roman vicus, flourishing in the second and third centuries AD, where the foundations have been uncovered of a small Celto-Roman temple.
Read more @ https://en.wikipedia.org/wiki/Aardenburg