Robert Ellis (also spelt Elis; 3 February 1812 – 19 August 1875), also known by the bardic name Cynddelw, was a Welsh language poet, editor, biographer, lexicographer and eisteddfod adjudicator.
He was born at Tyn y Meini, Bryndreiniog, Pen-y-Bont-Fawr, in the historic county of Montgomeryshire in Mid Wales, where he initially worked as a farm labourer.
First, in his capacity as one of the adjudicators at the local 1862 eisteddfod, Ellis praised the entry of Hanes Tredegar (lit.
[3][4] Second, Ellis helped Evan Powell, who entered his History of Tredegar into the local 1884 eisteddfod, to blossom 'into a lover of books'.
Ellis had his poem Yr Adgyfodiad published in 1849, in the Welsh-language newspaper Seren Gomer.