Griffith Llewellyn was a co-founder of the Rhondda Engine Works and Madelina (née Grenfell), his wife, was responsible for the building and restoration of several churches.

[1][2] Although Newman notes St Michael's College, Llandaff to be F. R. Kempson's most important work he describes the church at Pentre as his magnum opus.

The absence of supporting buttresses helps to accentuate the height of the tall four-stage west bell-tower with its north-east stair-turret and flat battlemented top.

[15][Note 2] Contrasting Pennant Sandstone and brick have been used to create a pink and buff-coloured banded polychromy that is the predominant feature of the interior and is described by Newman as "relentless".

[19] The Dictionary of Welsh Biography notes that the flag captured at the Battle of Toski (1889) by Francis Grenfell (brother of Madelina) is in the church.