Which famous poet had the middle name "Marlais"?

Dylan Marlais Thomas (1914-1953) is regarded by many as the greatest Welsh poet in recent times, although he wrote predominantly in English. His first names certainly represent his family's proud Welsh heritage. "Dylan" is from a character in the famous collection of folk tales, "The Mabinogion", and the more unusual "Marlais" is in honour of a great uncle of his, who was a Celtic bard under the name of "Gwilym Marles".

Thomas's family background was modest materially - he was born in a semi-detached house in Swansea - but literate and educated, with his father a schoolmaster.

He suffered from ill health as a child, and was never strong, though his early demise (in New York) was not wholly unconnected to his heavy alcohol consumption.

But though his life was short, it was highly productive, yielding such masterpieces as the radio play "Under Milk Wood", the nostalgic "A Child's Christmas in Wales", and, of course, many beautiful poems, perhaps most famously the villanelle (a type of 19 line verse with a repetitive rhyming scheme) "Do Not Go Gentle Into That Good Night", dedicated to his father.