Certain |
Possible |
Questionable Doubtful |
Rejected |
|
Confidence is a statement of the site as a medieval fortification or palace |
| Name | Alternative Name(s) | Type | Remains | Aberffraw llys and motte | Timber Castle Palace |
Earthworks |
| Beaumaris Castle | Masonry Castle | Major | |
| Beaumaris Town Walls | Urban Defence | Masonry foundations | Cae Llys, Rhosyr | Palace | Earthworks |
| Caer Gybi, Holyhead | Treffynnon | Masonry Castle Fortified Ecclesiastical site |
Major |
| Castell Aberlleiniog | Castell Llienawg; Aberllienawg; Castle in Anglesey; Castell Leiniog | Timber Castle | Earthworks | Castell Bryn Gwyn | Castle of King Olaf; Bon y Dom | Timber Castle | Earthworks | Castell Crwn | Llanrhwdrys; Castell Rhonyn | Timber Castle | Earthworks |
| Castell Porth Wen | Uncertain | Nothing visible | |
| Castell Trefadog | Porth Trefadog | Timber Castle | Earthworks | Llanallgo manor of Bishop of Bangor | Palace | Nothing visible | Llanfaes Town Defences | Urban Defence | Nothing visible | Lleiniog near Penmon | Timber Castle | Earthworks | Treffos manor of Bishop of Bangor | Palace | Nothing visible |
| Tregarnedd, Llangefni | Fortified Manor House | Uncertain | |
| Ynys Cefni, Llangefni | Timber Castle | Earthworks |