Gwent came into being after the Romans had left Britain, and was a successor state drawing on the culture of the pre-Roman Silures tribe and ultimately a large part of their Iron Age territories. It took its name from the "civitas" capital of "Venta Silurum", perhaps meaning "Market of the Silures". In the post Roman period, the territory around Venta became the successor kingdom of Guenta, later Gwent, deriving its name directly from the town through the normal sound change in the Brythonic languages from "v" to "gu". The town itself became Caerwent, "Fort Venta".