A cywydd by him is preserved in N.L.W. MSS. 669, 672, and Pen. MS. 124.
Published date: 1959
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Owens, B. G., (1959). DAFYDD ap HWLCYN ap MADOG, poet (17th century).. Dictionary of Welsh Biography. Retrieved 18 Jan 2021, from https://biography.wales/article/s-DAFY-APH-1600