He was born at Brownhill, Llansadwrn, Towy Valley, Carmarthenshire, the second son of Morgan Williams and his wife Sarah (née Davies).
Born into a prosperous Congregationalist family, his grandfather Morgan Williams had been an elder at Capel Issac near Llandeilo, before moving from Ffrwd-wen to his new residence at Brownhill.
[1] Another uncle, Benjamin Williams (1830–86) was also an Independent minister, serving at Gwernllwyn, Dowlais; Denbigh; and Canaan, Swansea.
While a student at Oxford, he participated in the vigorous debates which took place in his home constituency of East Carmarthenshire to choose a Liberal candidate for the 1890 by-election following the death of David Pugh.
Williams became involved in the Cymru Fydd movement, which emerged in the late 1880s, largely inspired by Tom Ellis.
[9] The Commission reported two years later and proposed establishing a Land Court to defend the rights of Welsh tenant farmers.
[13] He was therefore instrumental in engineering a shift in Welsh Liberal policy towards favouring the right of tenants to purchase their holdings.
[14] A renewed opportunity for election to the House of Commons arose in 1905 as a result of dissatisfaction in the Carmarthen Boroughs constituency with the sitting member, Alfred Davies.
In 1921, Williams fought the 1921 Cardiganshire by-election as an anti-Coalition Liberal, opposing Ernest Evans, Lloyd George's Private Secretary, the Coalition candidate.
[17] Although he lost, Williams performed well and was generally felt to have won a moral victory, forcing Evans to rely on Conservative votes for his election.
He wrote a number of short works in Welsh, including Gwilym a Benni Bach and Gwr y Dolau, which were popular in their day.
[1] He published a number of scholarly articles on Welsh history, notably on the Tudor period, under the auspices the Cymmrodorion.