Church of St Michael, Lower Chapel on the Brecknockshire Churches Survey site:"Small church dedicated to St Michael and also known as Llanfihangel Fechan, set ......... on the east bank of the Honddu, 7 km north of Brecon. It was apparently established at the end of the 18thC, and consequently contains nothing of earlier date."
Detailed information on deposited registers and transcripts for this parish is given under Breconshire Parish Registers on the Powys Archives website
As a guide only, the principal extant parochial church records for this parish span the dates shown below (as detailed in Parish Registers of Wales, NLW 2000) but exact current holdings should be confirmed with the individual Archives:
Baptisms 1819-1979; Marriages 1872-1971; Burials 1819-1981 Parish Registers, or copies, for all or part of these dates are held at the NLW and/or Powys Archives. Bishops Transcripts for various periods are held at the NLW.
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
You can see pictures of Llanfihangel Fechan which are provided by: