Certain |
Possible |
Questionable Doubtful |
Rejected |
|
Confidence is a statement of the site as a medieval fortification or palace |
| Name | Alternative Name(s) | Type | Remains |
| Aber Castle Mound | Abermenai; Pen y Mwd; Mwd Castle; Abergwyngregyn; Llan Boduan; Bangor | Timber Castle | Earthworks |
| Bangor Bishops Palace | Palace | Masonry ruins/remnants | |
| Bangor Castle | Timber Castle | Nothing visible | Bangor Town Defences | Urban Defence | Nothing visible | Bon y Dom | Timber Castle | Nothing visible |
| Braich y Dinas | Timber Castle | Earthworks | |
| Bryn Castell, Caerhun | Tal Y Cafn; Castell Maelgwn | Timber Castle | Earthworks |
| Caernarfon Castle | Caernarvon; Carnarvon | Masonry Castle Timber Castle Palace |
Major | Caernarfon manor of Bishop of Bangor | Palace | Nothing visible |
| Caernarfon Town Walls | Caernarvon; Kairarvon | Urban Defence | Major |
| Carn Fadryn | Garn Fadryn; Carn Fadrun; Madryn; Garn Fadrun | Masonry Castle Timber Castle |
Masonry ruins/remnants | Castell Abersoch | Castell Aber-Soch; Hen Gaer; Castellmarch | Timber Castle | Cropmarks/slight earthworks | Castell Llanddeiniolen | Tymawr | Timber Castle | Cropmarks/slight earthworks |
| Conwy Castle | Conway; Aberconwy | Masonry Castle | Major |
| Conwy Town Walls | Conway; Aberconwy | Urban Defence | Major |
| Criccieth Castle | Cricieth | Masonry Castle | Major |
| Degannwy Castle | Castle of Gannoc; Gannock; Dagaunoth; Deganwy | Masonry Castle Timber Castle |
Masonry foundations |
| Degannwy Town Defences | Gannoc | Urban Defence | Nothing visible |
| Dinas Emrys Castle | Masonry Castle Timber Castle Palace |
Masonry foundations | |
| Dolbadarn Castle | Masonry Castle | Major | |
| Dolbenmaen Castle | Tomen; Plas Dolbenmaen | Timber Castle | Earthworks |
| Dolwyddelan Castle | Masonry Castle | Major | Edern manor of Bishop of Bangor | Palace | Nothing visible |
| Gogarth Abbey, Great Orme | Gogarth Grange | Palace | Masonry footings | Gwydir Castle | Tower House | Masonry ruins/remnants |
| Nefyn | Tomen Nevin | Timber Castle | Earthworks | Pen y Castell, Garreg Olau | Caer Oleu | Masonry Castle Timber Castle |
Masonry foundations | Penrhyn Castle | Tower House | Masonry foundations |
| Pier Camp, Bangor | Timber Castle | Cropmarks/slight earthworks | |
| Sinadon | Snowdon; Smardon; Sinnodune; Castell Caer Lleion; Castell Caer Seion | Timber Castle | Earthworks |
| Tomen Castell, Old Dolwyddelan | Masonry Castle Timber Castle |
Earthworks | |
| Tomen Fawr, Llanystumdwy | Dolwydln; Domen Fawr; Llanystwmdwy; Glan-llynau | Timber Castle | Earthworks | Trefriw | Treurewe; Trevriw | Uncertain | Nothing visible |
| Twthill, Caernarfon | Timber Castle | Uncertain | |
| Ty Newydd Mount, Llannor | Y Mount | Timber Castle | Earthworks | Tyn Twr | Llanllechid | Timber Castle | Cropmarks/slight earthworks |
| Vortigern Castle, Pistyll | Nant Gwrtheirn | Timber Castle | Uncertain |