“Right Wales”
Destregales, Estregales, Testregeis
Chrétien de Troyes names it as the land of Erec and his father, Lac. It’s capital was Carnant, which may be Caruent in South Wales. In later romances, Erec’s land is Nantes.
The name “Destrigales” literally means “Right Wales,” probably indicating South Wales.
Sources
Erec | Chrétien de Troyes, late 12th century
Erec | Hartmann von Aue, late 12th century