 Created in the redistribution of seats in 1885 & from the old Glamorganshire constituency which had been in existence since 1541, the seat covered a wide area that included Maesteg, Llangeinor, Llynfi Valley, Aberpergwm, Margam Park, Briton Ferry, Glyncorrwg, Resolven.It was scrapped in the next redistribution of seats that took place in 1918.Following the creation of the seat in 1885, this predominantly mining constituency, which included the Llyfni, Garw and Ogmore valleys, was initially represented by the Lord Lieutenant of Glamorgan, Christopher Rice Mansel Talbot, who had served as a member for the Glamorgan county seat since 1830.