Good help from Gweplyfr/ Facebook!
Possibly either old phrase for "fair Gwent"
.....or gwenynen Gwent - a nickname for a very pro Welsh culture aristocratic lady (many Welsh elites had been losing their cultural connection then - becoming english gentry by then)
She owned a lot of land and helped poor Welsh speakers get jobs around Abergavenny/Y fenni......It might be on her old estate
"Augusta Hall, Baroness Llanover
aka Gwenynen Gwent
Augusta Hall by Charles Augustus Mornewick
Augusta Hall, Baroness Llanover (21 March 1802 – 17 January 1896), born Augusta Waddington, was a Welsh heiress, best known as a patron of the Welsh Language"