In 1870-72, John Marius Wilson's Imperial Gazetteer of England and Wales described Trefriw like this:
TREFRIW, a parish, with a village, in the district of Llanrwst and county of Carnarvon; on the river Conway, 2 miles NW of Llanrwst r. station. It has a post-office designated Trefriw, Carnarvonshire, an inn, and three annual fairs; and it conducts some river commerce in timber and slate. Acres, with Llanrhychwyn, 9,576. Real property of T. alone, £1,697; of which £37 are in quarries. Pop., 483. Houses, 98. The property is divided among a few. A seat of Llewelyn was here. The living is a rectory, united with Llanrhychwyn, in the diocese of Bangor. Value, £168.* Patron, the Bishop of Llandaff. The church was built in 1230.
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 Trefriw has changed, please see our redistricted information for the modern district of Conwy. More detailed statistical data are available under Units and statistics, which includes both administrative units covering Trefriw and units named after it.
GB Historical GIS / University of Portsmouth, History of Trefriw, in Conwy and Caernarvonshire | Map and description, A Vision of Britain through Time.
Date accessed: 28th February 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 "Trefriw".