Ystrad on Wikipedia.

Bethel Calvinistic Methodist Chapel dates from 1870. © Gervase N. E. Charmley.

Emmanuel Christian Fellowship, formerly the Tabernacle English Baptist Church (1870). © Gervase N. E. Charmley.

Providence Chapel. © Gervase N. E. Charmley.

St. Stephen. © Gervase N. E. Charmley.

A suspected former chapel has been identified as St. Stephen's church hall by Lewis Rees (thank you Lewis!). © Gervase N. E. Charmley.