Certain |
Possible |
Questionable Doubtful |
Rejected |
|
Confidence is a statement of the site as a medieval fortification or palace |
| Name | Alternative Name(s) | Type | Remains |
| Afon Lliw Mound, Llanuwchllyn | Uncertain | Earthworks | |
| Bala Town Defences | Urban Defence | Nothing visible | |
| Barmouth Tower House | Abermo; Abermaw; Y Bermo; Ty Gwyn | Tower House | Major |
| Bryn yr Erye Enclosure | Timber Castle | Uncertain | |
| Castell Carndochan, Dolhendre | Castell Carn Dochan | Masonry Castle | Masonry foundations |
| Castell Cynfal, Bryn Crug | Cynfael; Towyn; Bryn y Castell | Timber Castle | Earthworks |
| Castell Gronw, Bala | Llangower; Castell Gronw Bevr o Benllyn | Timber Castle | Earthworks |
| Castell Gwain Goch, Penrhyndeudraeth | Deudraeth; Deudrait; Castell Aber Iâ; Portmeirion; Gwaun Goch | Timber Castle Masonry Castle |
Cropmarks/slight earthworks |
| Castell Prysor | Cwm Prysor | Timber Castle | Earthworks |
| Castell y Bere | Caerberllan; 'a castle in Merionydd or Ardudwy', Teberri | Masonry Castle | Masonry ruins/remnants | Castell y Bere Town Defences | Urban Defence | Nothing visible | Corwen | Timber Castle | Uncertain | Crogen Motte, Llandderfel | Croegen; Cregan | Timber Castle | Uncertain |
| Cymmer Castle, Llanelltyd | Cymer | Timber Castle | Earthworks | Dernio | Castle of Edernion | Uncertain | Uncertain |
| Domen Ddreiniog, Llanegryn | Tomen Ddreiniog; Thorny Motte; Tal y Bont | Timber Castle | Earthworks |
| Erwr Castell, Dyffryn Ardudwy | Erw'r Castell | Uncertain | Nothing visible |
| Garth Rhiwaedog | Timber Castle | Cropmarks/slight earthworks | |
| Gwerclas | Llangar, The Mount | Timber Castle | Cropmarks/slight earthworks |
| Harlech Castle | Arlech | Masonry Castle | Major |
| Hendom Mound, Corwen | Timber Castle | Earthworks | Meirionydd | Uncertain | Uncertain | Meirionydd, Ardudwy | Uncertain | Uncertain |
| Oakley Arms | Maentwrog; Mayn Turroc; Ffestiniog | Timber Castle | Earthworks | Owain Glyndwrs House | Glyndyfrdwy | Fortified Manor House | Earthworks |
| Owain Glyndwrs Mount | Glyndyfrdwy; Owen Glendower's Mound | Timber Castle | Earthworks | Pen y Bryn y Castell | Uncertain | Nothing visible |
| Pen-uchar llan, Llanfor | Timber Castle | Earthworks | Rug Park Motte | Dernio | Timber Castle | Earthworks |
| Tomen Gastell, Bala | Tomen y Castell; Hen Hafod; Llanfor | Timber Castle | Earthworks |
| Tomen Las Castle Mound, Pennal | Y Domen Las; Towyn | Timber Castle | Earthworks |
| Tomen y Bala, Bala | Timber Castle | Earthworks | |
| Tomen y Castell, Gwyddelwern | Timber Castle | Cropmarks/slight earthworks | |
| Tomen y Mur, Maentwrog | Mur Castell | Timber Castle | Earthworks | Towre Kenvyn | Caer y Bont; Pen y Twr; Twr Cynfyn; Hendwr | Uncertain | Nothing visible |
| Ucheldre Mound, Corwen | Ucheldref | Timber Castle | Cropmarks/slight earthworks |