The Francis Jones Archive
The Francis Jones Archive is one of the largest collections of Welsh historical, genealogical and heraldic information outside the National Library of Wales, family history societies or universities. Its formation took over 70 years of research from one of Wales’s most prolific and brilliant historians. Much of the collated material comes from Parish records, the Public Record Office, the College of Arms, etc, etc, and from a life-long research of source material over a vast range of subjects. This really is a hidden gem of a site. It contains details of the archive of Francis Jones, probably west Wales' finest Genealogist. He lived a life full of intellectual romance and physical adventure and spent 70 years studying and writing about the families and history of west Wales.
The Parish of Llangynfelyn, Ceredigion
I wish I had some ancestors in the north Cardiganshire parish of Llangynfelyn as all the relevant transcripts can been found on this great little site. Many aspire to record online all the historical documents of their favourite parish but most give up before the task is completed. The site hasn't been updated since 2006 but that doesn't matter as all the work has been done. You will find census records, parish records, chapel records, tithe records, maps and photos. It's a joy to navigate and full marks to the individuals behind the project.
The Welsh Mariners Database
Even though west Wales is lapped by water on two sides we forget how important the sea was to our ancestors. Roads were virtually non existent and those that did exist were very rough. It would make much more sense to sail from say Aberporth to Milford Haven than try and get there by land. It is well worth checking this website which has been set up as a labour of love by Dr Reg Davies. It contains a fully searchable database of 23,500 mariners covering the period 1800-1945.
Genuki (Genealogy UK and Ireland)
Whatever stage you're at with your family history you will need to consult this quite amazingly comprehensive site. It is non-commercial and run by volunteers who know what they're doing. We are very very lucky in Wales to have one of the most dedicated family historians in the country in Gareth Hicks helping us out. He looks after most of the Wales pages. If it's not listed here it probably doesn't exist.
Crickhowell Archive Centre, Powys (formerly Breconshire)
This centre is run by volunteers and open most mornings. The centre’s collections focus on Crickhowell and the surrounding parishes. It includes census records, tithe maps and schedules, copies of early mapping, including the Beaufort Estate maps of 1587 and 1760, Ordnance Survey maps, aerial photographs, parish records, memorial inscription lists, local extracts from trade directories, indexes to local wills some of which have been transcribed, catalogues of estate sales, etc., together with much highly localised documentation not available elsewhere (notably an extensive photograph collection). We also have a reference collection of local history related books.
Crickhowell District Archive Centre, CRiC Building, Beaufort Street, Crickhowell, Powys, NP8 1BN
01873 810 922
If you're at the second stage of your research and have exhausted all the standard sources such as census data, wills and Births, Marriages and Death then a search through the Welsh Archives might prove fruitful.
This website covers all catalogued collections held by all 13 local government archive services in Wales plus the Welsh University archives, National Library, National Museum and Royal Commission for Ancient Monuments in Wales archives. The catalogues can be browsed, text searched or indexed searched. I particularly like the fact you can browse the archive as you might find something you didn't even know you were looking for. There is a fair amount of information for each indexed item but you will not be able to view the item itself online, you will have to visit or contact the archive repository for that.