He was first elected to Caernarfon County Council in 1907 and he remained a member until 1967 and was chairman in 1911 . He chaired the county education committee from 1916 to 1948 and as the chairman of the Central Welsh Board and a leader in educational circles in Wales he was able to implement some of the policies that he believed would protect the Welsh language and religion in Wales . He was ahead of his time in securing the status of Welsh in legislation and public administration ; he translated the Insurance Act of 1911 into Welsh and published it as a booklet with a list of legal terms in Welsh as an appendix. He chaired the National Union of Welsh Societies that was set up in 1913 and during his period in office a national petition was arranged ( 1938 ) to try to obtain appropriate status for the Welsh language in the country , a campaign that led to the Welsh Courts Act 1942 . He did much to encourage co-operation between county councils in Wales , particularly in education, and he was a firm believer in setting up a national educational council for Wales . He was a member of the deputation to the Minister of Education in 1920 to seek support for this policy. As Chairman of the Central Welsh Board , he made the suggestion that two pupils from secondary schools in every county should spend a week at the National Eisteddfod as guests of a fund that was set up with the proceeds from selling the offices of the Central Welsh Board in 1944 .

He was the honorary solicitor of the court and council of the National Eisteddfod from 1937 to 1956 and he made every effort to unite the Gorsedd of Bards and the National Eisteddfod Society and he was elected a Fellow of the Eisteddfod in 1956 . He also published material for children , Llyfr y cyfarfod plant ( 1908 ). He received an honorary LL.D. from the University of Wales in 1947 and the National Eisteddfod presented him with an address on vellum to mark his hundredth birthday. He was a member of Penymaes Chapel ( Scottish Baptists , Disciples of Christ ) and Berea (B) Cricieth and he received the Gee medal .

He was very able intellectually and he had the ability to express himself concisely and confidently. Without his self-sacrifice it is difficult to see how David Lloyd George could have developed into a professional politician so early in his career. The letters between them show that David placed great importance on William 's judgement on current topics and that impression is reflected in his speeches. He published My Brother and I ( 1958 ), Atgoff a Myfyr ( 1948 ) and Richard Lloyd ( 1934 ). He m. Anita Williams from Fishguard in 1910 ; she d. 1943 . They had twin sons but one died in infancy. He d. at Cricieth 25 Jan. 1967 and he was buried at Cricieth public cemetery.