 Davies wrote poetry under the pseudonym Davies Aberpennar.Until about 1948 he wrote in both Welsh and English, and after this almost exclusively in Welsh, which he had learnt as a young man.A member of Plaid Cymru, he was co-opted onto its Pwyllgor Gwaith Cenedlaethol at Easter 1947, Literary Editor of the party's monthly newspaper, "The Welsh Nationalist" from March 1947  and its Editor from April 1949 " During this period, the newspaper published new poetry by Idris Davies and R.S.