son of Howel ab Owain, Cefn Treflaeth, Llanystumdwy, Caernarfonshire, and Catherine, daughter of Rhisiart ap Dafydd of Cefn Llanfair. He was, therefore, a nephew of Huw ap Rhisiart ap Dafydd and a cousin of Richard Hughes. At his father's death in 1583 he became head of the family at Cefn Treflaeth, and he was one of those prosecuted by the Earl of Leicester during the troubles relating to Snowdon Forest. There is a copy of the beginning of Siôn ap Howel's Welsh translation of Rhetorica ad Herennium in Llanfair and Brynodol MS. 2 at the National Library of Wales. He died in 1626/7 and was buried in the choir of Llanystumdwy church.
Published date: 2001
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