In 1870-72, John Marius Wilson's Imperial Gazetteer of England and Wales described Rumney like this:
RUMNEY, a parish, with a village, in the district of Cardiff and county of Monmouth; on the river Rhymney and the coast, and on the South Wales railway, 2¾ miles W N W of Cardiff. Post-town, Cardiff. Acres, 3, 375; of which 1, 160 are water. Real property, £3, 428. Pop., 356. Houses, 75. The property is subdivided. An ancientcamp, surrounded by a fosse, is on an eminence over-looking the river. Building-stone is quarried. The living is a vicarage in the diocese of Llandaff. Value, £86. Patrons, the Dean and Chapter of Bristol.
GB Historical GIS / University of Portsmouth, History of Rumney, in Cardiff and Monmouthshire | Map and description, A Vision of Britain through Time.
Date accessed: 26th April 2017
Click here for more detailed advice on finding places within A Vision of Britain through Time , and maybe some references to other places called " Rumney ".