Tangwystl verch Goch
- Partnership: Llywelyn "Fawr" ap Iorwerth the Great" Prince of Wales 160,1012,1092
 Noted events in her life were:
• Background Information. 879
Tangwystl, daughter of Llywarch Goch, lord of Rhos Rhyfoniog and Anglesey, was the first wife* of Llywelyn ap Iorwerth, by whom he had Gruffydd ap Llywelyn, though Caradoc says he was base born. [Powel's Cardoc, p. 298; see White Book of Hergest; Polyd. Virfil, l. svi, p. 391] Upon her death, Llywelyn married Jone, the daughter of King John and sister of Henry III, and disinherited, or attemped to disinherit, Gruffydd, which caused great disturbance and wars; but Llewelyn, the son of Gruffydd, at last got the Principality.
~Archaeologia Cambrensis, Series IV, Vol VIII, p. 401
* Ancestral Roots calls her his mistress.
Tangwystl had a relationship with Llywelyn "Fawr" ap Iorwerth the Great" Prince of Wales, son of Iorwerth "Drwyndwn" ab Owain Gwynedd Prince of North Wales and Marared verch Madog 160,1012.,1092 (Llywelyn "Fawr" ap Iorwerth the Great" Prince of Wales was born in 1173 in Aberffraw Castle, Caernarvonshire, Wales,1013 died on 11 Apr 1240 in Aberconwy, Carnarvonshire, Wales 1013 and was buried in Abbey of Aberconwy, Carnarvonshire, Wales 1013.)
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