Tangwystl was born in Gwynedd, Caernarvonshire, Cymru, the daughter of Llewellyn ap Maredudd but her mother is unknown. The date is not known.
Her husband was Ieuan Fychan ap Ieuan. They were married, but the date and place have not been found. Their three known children were Gruffudd Gryg ap Ieuan (?-?), Rhys Fongam ap Ieuan Fychan (?-?) and Dafydd ap Ieuan Fychan (?-?).
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