In 1870-72, John Marius Wilson's Imperial Gazetteer of England and Wales described Gabalfa like this:
GABALVA, a hamlet in Llandaff parish, Glamorgan; near the river Taf and the Taf Valley canal and railway, 2 miles NE of Llandaff. Real property, £2, 657. Pop., 259. Gabalva House belonged to the Herberts, and passed to the Moggridges.
The location is where the name "Gabalfa" appears on the modern 1:25,000 map. Additional information about this locality is available for Cardiff
A Vision of Britain through Time includes a large library of local statistics for administrative units. For the best overall sense of how the area containing Gabalfa has changed, please see our redistricted information for the modern district of Cardiff. More detailed statistical data are available under Units and statistics, which includes both administrative units covering Gabalfa and units named after it.
GB Historical GIS / University of Portsmouth, History of Gabalfa, in Cardiff and Glamorgan | Map and description, A Vision of Britain through Time.
Date accessed: 24th May 2013
Click here for more detailed advice on finding places within A Vision of Britain through Time, and maybe some references to other places called "Gabalfa".