Leland describes Credine as `a commote of Cairarvonshire on this side Conwey River' and says that `partely be Conwey Ryver, partely by the se [it] is yn a maner as insulatid, and one way owte of Denbigh land the way is over a made causey over a marsch often overflowen ...' - Itinerary, III, 89. It may well now be under the sea.