Gronwy ap Ieuan of Havod y Wern
- Born: Hafod-y-Wern, (Bersham, Wrexham, Denbighshire), Wales
- Marriage (1): Alsion verch Kynrick ap Meredith Ddu of Anglesey
Other names for Gronwy were Goronwy ap Ieuan of Havod y Wern, Grono ap Ievan of Hafod-y-Wern and Gronw ap Jevan ap Gronw of Hafod y wern.
Source: The History of the Princes, the Lords Marcher, and the Ancient Nobility of Powys Fadog, and the Ancient Lords of Arwystli, Cedewen, and Meirionydd by J. Y. W. Lloyd, Vol. II (London, 1882) has from Cae Cyriog M.S.; Lewys Dwnn, vol ii:
"Alson, heiress of Havod y Wern, and dau. of Howel ab Ieuan ab Gruffydd of Bersham, and Alson, his second wife, d. and heiress of Howel ab Goronwy of Havod y Wern."
Source: A Genealogical and Heraldic Dictionary of the Landed Gentry of Great Britain & Ireland" by John Burke & John Bernard Burke, vol. I (London, 1847), p. 656
Gronwy married Alsion verch Kynrick ap Meredith Ddu of Anglesey.