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Certain |
Probable |
Questionable or Doubtful |
Rejected |
|
Confidence is a statement of the site as a medieval fortification or palace | ||||
Name |
Alternative Name(s) |
Island |
Type |
Remains |
| Essex Castle | Essex Farm; Fort Essex; Les Murs de Haut; Upper Fort | Alderney | Artillery Fort | major building |
| The Nunnery | Les Murs de Bas; Chateau de Longis; Lower Fort; Castrum Longini; Lower Fort | Alderney | Fortified Manor House, Artillery Fort | major building |
| Castle Cornet, St Peter Port | Chateau-Cornet; Cornet Rock; Castle Rock; castri de Gerner'; Corneyt | Guernsey | Masonry Castle, Artillery Fort | major building |
| Jerbourg Castle | Chirburgh; Girburgh; Gyrbourg, Gerebrok; Gerbourkes; Gierebouk | Guernsey | Timber Castle, Masonry Castle | earthwork |
| Vale Castle | Le Chateau St Michel; Chateau de Val; Chateau de Valle | Guernsey | Masonry Castle, Artillery Fort | masonry ruins/remnants | Chateau Des Marais | Ivy Castle; Marais d' Orgeuil; Chateau d'Orgueil; The Marsh Castle | Guernsey | Timber Castle | earthwork | St Peter Port Town Defences | Beauregard Tower; Tour Beauregard; La Tour Grand; Le Tourgand | Guernsey | Urban Defence | no visible |
| Chateau De Rocquaine | Fort Grey; Châté dé Rocquoïne | Guernsey | Timber Castle, Masonry Castle | no visible |
| Elizabeth Castle | Islett of Saynt Helyer | Jersey | Artillery Fort | major building |
| Grosnez Castle | Jersey | Masonry Castle | masonry ruins/remnants | |
| Mont Orgueil Castle | Gorey Castle; Jerres', Gurry | Jersey | Masonry Castle, Artillery Fort | major building |
| St Aubins Fort | St Aubyn; Islet of Sayntobyn | Jersey | Artillery Fort | major building | Les Catieaux | Les Câtiaux; Les Cateaux; le Chastel-Sedement; Sedeman; Ceasar's Camp | Jersey | Timber Castle | earthwork | St Ouen's Manor | St Owen | Jersey | Fortified Manor House | masonry ruins/remnants |
| Castel de Lecq | Le Câtel de Lecq | Jersey | Timber Castle | earthwork |
| Castel Rozel | Le Câtel de Rozel; La Petite Césaree | Jersey | Timber Castle | earthwork |
| Bishopscourt | Bishop's Court; Ballachurry; King Orry's Tower; Kirkmichael | Man | Palace, Pele Tower, Masonry Castle | major building |
| Castle Rushen | Russin; Castellum de russyn | Man | Timber Castle, Masonry Castle | major building |
| Cronk Howe Mooar | Fairy Hill; Cronk Mooar; Cronk y Mur | Man | Timber Castle | earthwork |
| Derby Fort | St Michaels Island; Fort Island | Man | Artillery Fort | major building |
| Douglas Artillery Fort | Pollock rocks; Paul Bridson's Parlour | Man | Artillery Fort | no visible |
| Peel Castle | St Patricks Isle | Man | Timber Castle, Masonry Castle, Artillery Fort | major building | Bride Motte | Lambhill | Man | Timber Castle | earthwork | Peel Bay Battery | Man | Artillery Fort | no visible | Santon Broogh | Moaney | Man | Timber Castle | earthwork |
| Cashtal Lager | Ballagawne | Man | Timber Castle, Fortified Manor House, Uncertain | earthwork |
| Cass ny Hawin | Man | Timber Castle | earthwork | |
| Castleward Fort | Knock y Troddan; Hill of the Fight; Sod Castle; Cashtal yn Mhoid | Man | Timber Castle | earthwork |
| Close ny Chollagh | Close ny Chollaugh | Man | Timber Castle | earthwork |
| Congary Brooghs | Man | Uncertain | no visible | |
| Cronk ny Merriu | Cronk ny Marroo; Cronk-na-Myrriow; Cronk y Merritt; Hill of the Dead | Man | Timber Castle | earthwork |
| Cronk Sumark | Cronkshamerk; Primrose Hill | Man | Timber Castle | earthwork |
| South Barrule hill fort | Man | Timber Castle, Uncertain | earthwork | |
| The Court | Man | Palace | no visible | |
| Ballakaighan | Ballalough; Ballakeighan; Ballakaighen | Man | Timber Castle | earthwork | Sark forts | Le fort | Sark | Artillery Fort | earthwork |
