[2] The origins of the church at Heolyfelin date back to the 1840s, when prayer meetings and a Sunday school were established in the area that later became known as Trecynon.

[1] Heolyfelin, literally the 'Mill Road', refers to the Aberdare Ironworks at nearby Llwydcoed which were established in 1800.

When Ysguborwen Colliery was opened at Llwydcoed in 1849, those who moved to the locality included many Baptists, and they initially held prayer meetings at the Wesleyan Chapel.

[1] The chapel was designed in 1852 by Thomas Joseph, an engineer from Hirwaun who was involved in colliery enterprises at Aberdare.

Thomas Joseph had opened a new colliery at Trecynon and he persuaded many colliers who were members at Ramoth to move with him from Hirwaun.