In 1870-72, John Marius Wilson's Imperial Gazetteer of England and Wales described Pontrhydfendigaid like this:
PONTRHYDVENDIGAID, or Riddenfigget, a village in the N E of Cardigan; on an affluent of the river Teifi, near the affluent's mouth, 5½ miles N N E of Tregaron. It has a post-office under Carmarthen, is a fishing-station, and has a small inn. The ruins of Strata-Florida abbey are in the vicinity.
Additional information about this locality is available for Ystradmeurig
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 Pontrhydfendigaid has changed, please see our redistricted information for the modern district of Ceredigion. More detailed statistical data are available under Units and statistics, which includes both administrative units covering Pontrhydfendigaid and units named after it.
GB Historical GIS / University of Portsmouth, History of Pontrhydfendigaid, in Ceredigion and Cardiganshire | Map and description, A Vision of Britain through Time.
Date accessed: 02nd August 2015
Click here for more detailed advice on finding places within A Vision of Britain through Time, and maybe some references to other places called "Pontrhydfendigaid".