Rhys Gryg

[2] He married Mathilde, the daughter of Richard de Clare, 3rd Earl of Hertford and Marcher Lord of Cardigan.

Rhys Gryg formed an alliance with Gruffydd against Maelgwn, then in 1195 joined with another brother, Maredudd, in a conspiracy against their father and captured Dinefwr Castle.

By 1211 Rhys had fallen out with his nephews, who were supporters of Llywelyn ab Iorwerth, and intervened on behalf of King John of England, attacking and capturing Llandovery from them with the help of English royal troops.

After John forced Llywelyn to give up all his conquests outside the core area of Gwynedd, Rhys joined with Maelgwn to eject his nephews from the remainder of their lands.

In 1213 an English army led by Falkes de Bréauté was sent to strip Rhys Gryg of his lands and give them to his nephews.

The assumption about Gwenllian was, however, unfounded as Rhys Mechyll, Lord of Dinefwr, also had male heirs[6] who acceded to the arms of the House of Deheubarth.

Arms of the House of Deheubarth: [ 1 ] Gules , a lion rampant or within a bordure engrailled or . These arms were inherited by the Talbot family, later Earls of Shrewsbury .
19th-century imaginary portrait of Rhys Gryg by Jean Pierre Victor Dartiguenave