"This district was defined by an Order in Council, July 21st, 1855, to be all those portions of the parishes of Henllan and Llansannan, situate on the southern and eastern sides of an imaginary line commencing on the eastern boundary of Henllan, at a point in the middle of the high road leading from Felin Segrwyd, or Egryn Mill, to Groes Fawr; and thence extending towards the north-west, along the middle of the road to Llansannan, as far the boundary of the two parishes; thence again, along the middle of the same road as far as Pont Deunant, which crosses Afon Deunant; from which this stream becomes the boundary as far as the junction of the stream called Afon Ucha, which in its turn becomes the boundary until it again meets the above-mentioned boundary between the two parishes. This area is of very considerable extent, being about eight miles long by about four in its greatest width, covering an area of upwards of 8000 acres in the several townships of Uwch Caerau and Taldrach, in Henllan, and Deunant and Grugor, in Llansannan." [From The History of the Diocese of St. Asaph , 1908-1913, Ven. D.R. Thomas]


Church History

Ordnance Survey reference SH 976629.
The church, dedicated to St. Thomas, was consecrated on 27 October 1857.

The Clwyd FHS website has a photograph of the church.

Nonconformist Churches

"Welsh Church Commission - County of Denbigh - The Statistics of the Nonconformist Churches for 1905" lists the following nonconformist places of worship in the Civil parish of Bylchau :

Name of Chapel Denomination Number of "adherents"
Groes Calvinistic Methodists 230
Hebron Calvinistic Methodists 42
Rhiw Congregationalists 112

Church Records

Parish Registers

  • The following Parish Registers have been deposited at the Denbighshire Record Office, Ruthin.
    They may be viewed on microfilm at the Denbighshire and Flintshire Record Offices, and at the National Library of Wales, Aberystwyth.
    These microfilms are not available elsewhere.
Baptisms Marriages Burials
1857 - 1994 1858 - 1969 1858 - 1994

Bishop's Transcripts

  • No Bishop's Transcripts have been deposited for St. Thomas, Bylchau.


  • There are no official I.G.I. entries for St. Thomas, Bylchau.

Civil Registration

The new parish of Bylchau was assigned to the St. Asaph Registration District;.

In the GRO indexes to civil registration, entries for Bylchau are in the format :

  • Years 1837 - 1851: St. Asaph XXVII. nnn
  • Years 1851 - 1930: St. Asaph 11b. nnn

(GRO index references have no relevance at the local Superintendent Registrar's Office)


Description & Travel

You can see pictures of Bylchau which are provided by:




Historical Geography

You can see the administrative areas in which Bylchau has been placed at times in the past. Select one to see a link to a map of that particular area.



"North-East Wales Churches and Ancient Parish Boundaries" produced by Clwyd Record Office in 1994, published by Genuki with the permission of Flintshire Record Office and Denbighshire Archives

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 SH976629 (Lat/Lon: 53.153356, -3.532737), Bylchau which are provided by:



  • In 1831- this was not a separate parish.
  • In 1901- the population was 412.
    [ Royal Commission on the Welsh Church - October 1907]


  • Archdeacon Thomas gives the area of the parish as "upwards of 8000 acres".
    [ The History of the Diocese of St. Asaph , 1908-1913, Ven. D.R. Thomas]