The cywydd 'Y ddyn winfaeth ddynionfawr' is attributed to him in four manuscripts (Cwrtmawr MSS. 5 (386), 27 (329); NLW MS 1246D (42), NLW MS 5269B (2586), but it is also attributed to Ieuan ap Gronwy (Peniarth MS 99 (57), Mostyn MS. 160 (383)), and Ieuan ab Huw (Jesus College MS. 17 (675), whilst in two manuscripts the name of the author is not given (Mostyn MS. 161 (292), Peniarth MS 66 (42) - 'ai kavodd ai kant'). The earliest copy is that given in Mostyn MS. 161 (c. 1563). 'Er athrod trwm weithred traw' in Cardiff MS. 12 (295) is also attributed to him.
Published date: 1959
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