The Gwynedd Family History Society index of marriages lists only the date and names
of this marriage at Llangeinwen church:
7.5.1830 William Thomas to Grace Hughes
I don't have access to the parish baptisms of that time but I can provide the
marriages of his probable daughters at Llangeinwen church:
12.10.1852
William Parry, bachelor of full age, labourer of Rhuddgaer s/o William Parry labourer
to Ellen Thomas, spinster of full age, d/o William Thomas labourer of Llangaffo.
21.2.1854
Williams Griffith, bachelor aged 22, labourer of Gwalchmai s/o Hugh Griffiths labourer
to Catherine Thomas, spinster aged 22 of Groeslon, d/o William Thomas labourer.
Groeslon was located in an exclave of the parish of Llangeinwen known as the
Rhandir, and seems to have developed into a village in the middle 1800's, since
it is not shown on an 1818 map of the area. The cottage where William Thomas
lived was probably built on the farm called Cae'r berllan (aka Berllan green),
owned by Evan Owen, whose will in 1840 described six houses in a row "built by
me in Groes lon grin" and bequeathed to his 3 daughters. Nearby, just across
the parish border, was the parish church of Llangaffo and in 1884, the Rhandir
was transferred from Llangeinwen to Llangaffo, and Groeslon became the modern
village of Llangaffo.
This may explain why William Thomas and his wife Grace were buried at Llangaffo
church and he was sometimes said to be of Llangaffo.