The ancient parish comprises the townships of Llan (or Tre'rllan), Moelfre, Penyfed, Rhosymaenbrych, Disgarth, Llys Dinmael, Cefn Cymer and Ystradelog (or Nanthalog).
There are references to a church on the site in the early thirteenth century. The church was rebuilt in 1747, and was restored in 1873/1874. It was closed some years ago, and services for the parish are now conducted in St. Catherine's, Dinmael.
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St. Catherine's church in Dinmael was opened in 1878. The parish church, at Llangwm, was closed some years ago, and services for the parish are now conducted in St. Catherine's church.
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For family history information about the churches and parish, visit the GENUKI Llangwm page.