Giraldus Cambrensis wrote about the lake in his book about journeying through Wales in the late 12th century, reporting the local tradition that the birds in the area only ever sang for a truly Welsh prince or ruler... As this 'house on the lake' was one of several royal houses belonging to the rulers of Brycheiniog... The crannog at Llangorse, in effect an artificial island, measures about 40 metres in width and is situated 30 or 40 metres off the northern shore of the lake... Timbers from the wooden palisade that used to surround the island have been dated to...