Thomas Glynne Davies (12 January 1926 – April 1988), usually known as T. Glynne Davies, was a Welsh poet, novelist and television and radio broadcaster. Davies was born at 64 Denbigh Street, in Llanrwst, Denbighshire, Wales.
From wikipedia:
https://en.wikipedia.org/wiki/T._Glynne_Davies
And, a family tribute website:
http://www.penmon.org/page41.htm
The plaque says:
Yma Canwyd
Y Bardd A'r Llenor
T. Glynne Davies
1926 - 1988