* I recall being told off for spelling the name of my home village incorrectly whilst in class at the Dinas Powis (Powys) Primary School back in the latter half of the 1950's. We were a railway family and I often had a railway ticket in my grubby little mitt which clearly stated from Dynas Powys to where-ever. Yes, that's right, Dynas. 60 years later, whilst reading a booklet about the history of the Barry Railway by D. S. M. Barrie, I read that the incorrect spelling was in fact an error on the part of the printing company. I got a good telling off because of their mistake it seems - thanks a lot!
Subsequently, I found an old map, apparently the first one-inch to a mile map of Glamorganshire, which was surveyed in the 1790's and published in London in 1799 by John Cary (1754-1835) which gives the place name as Dynas Powis. The mystery deepens!