An Inventory of the Historical Monuments in Herefordshire, Volume 1, South west. Originally published by His Majesty's Stationery Office, London, 1931.
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'Plate 177: Longtown Castle', in An Inventory of the Historical Monuments in Herefordshire, Volume 1, South west(London, 1931), British History Online https://www.british-history.ac.uk/rchme/heref/vol1/plate-177 [accessed 10 May 2025].
'Plate 177: Longtown Castle', in An Inventory of the Historical Monuments in Herefordshire, Volume 1, South west(London, 1931), British History Online, accessed May 10, 2025, https://www.british-history.ac.uk/rchme/heref/vol1/plate-177.
"Plate 177: Longtown Castle". An Inventory of the Historical Monuments in Herefordshire, Volume 1, South west. (London, 1931), British History Online. Web. 10 May 2025. https://www.british-history.ac.uk/rchme/heref/vol1/plate-177.
Longtown Castle.
Keep, from the N.W. Late 12th or early 13th-century.