A castle in the country of Nantes.
Erec gave this splendid and rich fortress, built in the time of Adam, to Licorant (or Koralus) when he married Licorant’s daughter Enide. Erec called it a splendid, rich forest built in the time of Adam. This gift brought Licorant out of poverty.
R.S. Loomis (Tradition, 76) identifies it with Castle Rudlan in North Wales. The Rhuddlan Castle is situated on the banks of the River Clwyd, near the North Wales coast. It was constructed between 1277 and 1282, although the site has a history that predates the castle itself. Archaeological investigations have revealed some evidence of earlier occupation, but the full extent and nature of any pre-existing settlements are subject to ongoing research and exploration by historians and archaeologists.
Source
Erec | Chrétien de Troyes, late 12th century