The map above is copied from Ms. Jamieson’s article (s.p.b.s) and is entitled ‘sites advanced as certain or possible castle locations within the Holderness region’. So the sites not previously discussed are; ‘certain castles’ = Swan Hill, Burstwick and Roos while the ‘possible castle’ sites are Paull Holme, Aldbrough, Rise and Hornsea.
Swan Hill is a grass-covered earthen hill in the parish of Bilton. It stands about 1.5m. high and is surrounded by a 13m. wide ditch.
Burstwick Castle site is a large enclosure with a moat to three sides. The moat is often water-filled.
Roos Castle site is a ‘sub-rectangular moated enclosure’ measuring about 90m by 62m.
Paull Holme has no extant remains, these having probably been destroyed in the later episodes in the construction of Paull Fort.
Aldbrough has no extant remains.
Rise site is not covered in the article.
Hornsea is an oval mound 72m by 45m immediately west of Hornsea Mere, in the grounds of Wassand Hall.
Swan hill’s site is identified on Explorer O.S. map 293 at 157328.
Burstwick Castle site is located on Explorer O.S. map 292 at 220292.
Roos Castle moat is located on Explorer O.S. map 292 at 281296.
I must here thank Ms. Jamieson for her informative and thought-provoking article.