Williams was born to a deeply religious family in East Finchley, Greater London.
He attended Brynrefail Grammar school and at Jesus College, Oxford He took first-class honours in English in 1933, and theology in 1935.
He was made a deacon at Michaelmas 1937 (18 September)[1] and ordained priest the following Michaelmas (24 September 1938) — both times by William Havard, Bishop of St Asaph, at St Asaph Cathedral.
He was also influential in the decision to ordain women priests and the creation of the first Welsh television station S4C.
When a Welsh version of the Bible was published Williams was invited to preach before Queen Elizabeth II in St Asaph and Westminster Abbey.