The cause dated back to 1749 and services were held in the Welsh language.

The chapel was demolished in 1967 as part of the Merthyr Town Improvement Scheme.

[1] The original cause at Ynysgau was established by various ‘Dissenters’ from the Church of England.

[2] It was acquired by the Independents (Congregationalists) by the early nineteenth century.

[2] A contemporary account described the new building as a "new structure of much architectural beauty, decorated with coloured glass windows.