Good morning!
These are good ideas. I have seen these but did not report them. I am extremely impressed by the National Library of Wales, it has to be one of the best such resources in the world. The existence of the land ownership maps ca 1840 is stunning. Kudos to all involved with NLW. Your comment about Herbert and the link to the 16th century Sheriff is interesting. I poked around a little on this. Does the fact that this William bore Herbert arms imply that they were transmitted in the male line? I guess not, since William the Sheriff’s father John was not a Herbert. There is a sad lack of information about mothers and wives, just characteristic of the era, I guess. So I guess a Herbert daughter is an ancestor of the Sheriff and arms were granted based on such a link?
Where Tregiriog is concerned, Bradney describes it as a Jones possession up until Tregose. This Tregose can be found a few places in google books, but his origins are not clear, Bradney basically says he has no idea who he was. Then the house is owned by Jones again in the middle-late 19th century. There are records which I will assemble later that show that Parliament had to take some action (I think) with respect to William the sheriff’s Perpetual bequest to the poor of Llanishen. There was a petition by Henry Warrilow (the vicar), John Jones (Churchwardens, I *guess* my John) and others in the 1820 about this. Let me send details later. This raises a question, I have been surprised that most of these people, including John Jones (ca 1771-1848) made their mark. Would it be possible in the early 1800s that a Churchwarden might be illiterate?
There are some possible links to Breconshire too, but quite unclear at the moment.
Alas I have to do my real job, will add some more later. Thank you! Dave