Under the Local Government Act 1972, the use of Denbighshire for local government and ceremonial purposes ended on 1 April 1974, with the creation of the new county of Clwyd. A different county of the same name was created on 1 April 1996, for modern local government purposes, covering a substantially different area from the historic county.
The National Library of Wales has just uploaded (Feb 2018) a website covering the tithe maps of Wales with accompanying apportionment documents using original and present-day maps. There are over 300,000 entries. Landowners and small villages are included. The presentation looks very good.
GENUKI has a page on each of the old counties of Wales and, under these counties, pages for each of the ecclesiastical parishes within the county. Information is gathered under a number of headings and the amount of information varies from parish to parish. Parish descriptions are based on a gazetteer dated 1835 and thus the emphasis is on ecclesiastical parishes. (Civil parishes were not yet established.) The submitter is very firm about his copyright. This should not stop anyone from reading the material.
The GENUKI Pembrokeshire pages include, under Description and Travel close to the bottom of the page, a link "parish map" to a map website showing boundaries and settlements before 1850. On the linked page will be maps of several parishes located close to each other.
GENUKI also provides references to other organizations who hold genealogical information for the local area, but there is no guarantee that the website has been kept up to date for every county.
FreeBMD provides a link to a list of the civil registration districts for each Welsh county from 1837 to 1996. Civil registration districts changed with varying densities of population and improvements in communication. Most counties and unitary authorities now have only one district. The list helps with providing names for the registration districts listed in the FreeBMD index and also as a guide for where to look for census entries.
The FamilySearch Wiki has a series of pages similar to those provided by GENUKI and these have been prepared at a later date. The Wiki may look like Wikipedia but the information has been provided for family historians. There are tables of links between the parishes in the historic counties of Wales and their post-1996 counterparts. This is the only genealogical website found that provides this information universally; others are not as thorough.
Some words in Welsh come up time and time again and you may want to know what they mean or how to pronounce them. For example, "Eglwys" is a church and the prefix "Llan" is a parish. "w" and "y" are used as vowels in Welsh. "Ll" is pronounced either "cl" or "hl" or somewhere in between. "dd" sounds like "th". The single letter "Y" is "the" and "Yn" means "in". "uwch" means "above"; "isod" is "below" or "under"; "gwch" is "great", "ychydig" is "little"; "cwm" is a "valley".
In both Welsh and English all these words are commonly used in place names in the UK. Place names are often hyphenated, or two words are combined into one. Entering your problem phrase into Google Search, including the term "meaning in Welsh", will lead you to Google's quick translation guide. I'm no authority; these are just things I have picked up while building up this gazetteer for WeRelate.
