 Though the population of the Rhondda was embracing English as its first language , during the 1940s a literary and intellectual movement formed in the Rhondda that would produce an influential group of Welsh language writers . Formed during the Second World War by Egyptologist J. Gwyn Griffiths and his German wife <unk> Bosse @-@ Griffiths , the group was known as the Cadwgan Circle ( <unk> Cadwgan ) , and met at the Griffiths ' house in Pentre . The Welsh writers who made up the movement included Pennar Davies , Rhydwen Williams , James Kitchener Davies and Gareth Alban Davies . 
