 Of the Cadwgan Circle , the most notable of their number is Rhydwen Williams , the winner of the Eisteddfod Crown on two occasions who used the landscape of the industrial valleys as a basis for much of his work . Writing in the English language Peter George was born in Treorchy and is best known as the Oscar nominated screenwriter of Dr. Strangelove , based on his book Red Alert . Reflecting the lives of the residents of the Rhondda , both Gwyn Thomas and Ron Berry brought a realism to the industrial valleys which was missing in the more rose @-@ tinted writings of Richard Llewellyn . 
