"ST. MELLONS, a parish in the hundred of Wentllooge, county Monmouth, 3½ miles N.N.E. of Cardiff, and 7 S.W. of Newport. It is situated on the river Romney, and is a small agricultural village. The living is a vicarage in the diocese of Llandaff, value with the curacy of Llanedarn, £160, in the patronage of the bishop and chapter, who, with the Dean and Chapter of Bristol, are the appropriators. The church is an ancient structure. The charities produce about £15 per annum."
[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.
St Mellons Parish; Statistics; Area 2574 acres; Population 324 males, 313 females, total 637
St Mellons Parish Church Attendance - morning 27 2 (?) services, 1 in Welsh Edward Jenkins, Vicar
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 ST229813 (Lat/Lon: 51.525282, -3.112778), Llaneirwg / St Mellons which are provided by: