"UNDY, a parish in the lower division of Caldicott hundred, county Monmouth, 7 miles S.W. of Chepstow, and the same distance from Caerleon, its post town. The village is situated near the coast of the Bristol Channel. The living is a vicarage* in the diocese of Llandaff, value £183, in the patronage of the dean and chapter." [Description(s) from The National Gazetteer of Great Britain and Ireland (1868)
Brown, Richard. The excavation of a medieval trackway and stone structures at Undy. Monmouthshire Antiquary 15 (1999), p. 6-18.
Jones, Malcolm. Caldicot and the villages of the Moor in old photographs : including the villages of Portskewett, Sudbrook, Rogiet, Undy, Magor and Redwick. Volume 1. Abertillery : Old Bakehouse, 1995. 128p.
Church and chapel data from The Religious census of 1851 : A Calendar of the returns relating to Wales, Vol 1, South Wales.Ed. by I.G Jones, & D. Williams. UWP, Cardiff, 1976. The names given towards the end of each entry are those of the informants. Check with Gwent RO to see what extant records are held, and possible names of chapels/churches built after 1851.
Undy Parish; Statistics; Area 3717 acres; Population 192 males, 181 females, total 373
Undy Parish Church Attendance - (average) morning 60 + 20 scholars, afternoon 70, evening 35 1 service in English William Jones, Vicar
Family Search have an interactive map called "England and Wales Jurisdictions 1851" showing parish (and other) boundaries with optional background maps such as Ordnance Survey. There is also a Search facility, do read the guidance notes to get maximum benefit from this useful resource. See here for further background information to assist in the interpretation of this data
Kain, R.J.P., Oliver, R.R., Historic Parishes of England and Wales: an Electronic Map of Boundaries before 1850 with a Gazetteer and Metadata [computer file]. Colchester, Essex: History Data Service, UK Data Archive [distributor], 17 May 2001. SN: 4348. Here is a gazetteer/finding aid plus a set of overview maps to accurately identify the position of parishes within the county.
You can see maps centred on OS grid reference ST436867 (Lat/Lon: 51.576329, -2.815268), Gwndy / Undy which are provided by: