Though Somerset has traditionally had a red dragon as an emblem, the red dragon is more commonly associated with Wales, as its national flag features a red dragon (Y Ddraig Goch). This may originate in Arthurian Legend where Myrddin, employed by Gwrtheyrn, had a vision of the red dragon (representing the Britons) and the white dragon (representing the invading Saxons) fighting beneath Dinas Emrys. This particular legend also features in the Mabinogion in the story of Lludd and Llefelys. The legendary house of Pendragon and Celtic Britain in general have become associated with the Welsh dragon standard after the fact. Dragons of Celtic mythology can be good or evil, as seen above.