His work is mainly written in his native Welsh language .
His work is mainly is noted for adapting the established style and context of Welsh poetry from a rural and bygone age to that of a modern industrial landscape , while retaining traditional prosody and metre .
His work is mainly written in his native Welsh language , and is noted for adapting the established style and context of Welsh poetry from a rural and bygone age to that of a modern industrial landscape , while retaining traditional prosody and metre .