"This place is about half way between Pontardawe and Ystalyfera. ... Since the population of this district is likely to grow greatly, it is to be expected that there will soon be a large congregation." Hanes Eglwysi Annibynnol Cymru.
Rees, Thomas & Thomas, John. Hanes Eglwysi Annibynnol Cymru. (History of the Welsh Independent Churches),volume 2, pages 181-82, 1872. Here is the ( Welsh) extract from this book relating to Ynysmudw, contributed by Darris G Williams - with translation by Eleri Rowland
The church is dedicated to St. Mary, is in the Benefice of Llangiwg (Pontardawe), and the diocese of Swansea and Brecon. Details of the present incumbent of this benefice can be found at the Church in Wales website. The church can be located at grid reference SN739058.