An Inventory of the Historical Monuments in Essex, Volume 4, South east. Originally published by His Majesty's Stationery Office, London, 1923.
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Citation:
Earthworks.
The Keep-mound.
The Ditch between the Mount and Bailey.
Rayleigh: (2). The Castle. End of 11th century.
Hockley: (9). Plumberow Mount.
Downham: (2). Barn Hall. Part of Moat.