The first prayer meetings are said to have been held at the house of a John Weeks in Fforchaman Road and were mainly attended by members of Gwawr, Aberaman.

Humphreys was a founder member of Aberdare Urban District Council and a trustee of Cwmaman Public Hall.

The 1904-05 revival had a profound impact at Seion, with many attenders who had been present as listeners for decades becoming full members of the church.,[2] Humphreys was succeeded by W.R. Lewis, who remained until 1914 when he moved to Hill Park Chapel, Haverfordwest.

[4] Leeke was a native of Talybont, Cardiganshire and trained for the ministry at the South Wales Baptist College, Cardiff.

[4] He began his ministry at the Public Hall after the chapel was severely damaged by a storm in January of that year.