"MATHERNE, a parish in the upper division of the hundred of Caldicott, county Monmouth, 2 miles S. of Chepstow, its post town, and 14 from Newport. It is situated on Matherne Pill, at which place the river Wye joins the Severn. A house called Monks Court is partly of the 15th century, and was inhabited by the bishops of Llandaff until 1706, but it is now converted into a farmhouse."
[Description(s) from The National Gazetteer of Great Britain and Ireland (1868)
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 established after 1851.
Matherne Parish; Statistics; Area 3281 acres; Population 238 male, 213 female, total 451
Mathern Parish Church Attendance - morning 35, afternoon 40 2 services in English Informant; Chrs Davis
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 ST523908 (Lat/Lon: 51.613950, -2.690324), Matharn / Mathern which are provided by: