Roberts, a Calvinistic Methodist minister, was a noted Welsh-language poet, the winner of the Crown at the 1902 National Eisteddfod of Wales with his poem "Trystan ac Esyllt".

From 1901 until 1912 he was a Calvinistic Methodist minister, firstly in Lewisham, London, and then in Tanygrisiau, Blaenau Ffestiniog, Merionethshire.

While living in London in the early 1900s Roberts met and befriended Vladimir Lenin.

[2] A Socialist and a close associate of the academic and politician W. J. Gruffydd, Roberts represented the Labour Party on Merioneth County Council.

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