The Chronicle of the Princes of Wales records in 1210 that "all the Welsh princes, except Rhys and Owain the sons of Gruffudd son of Rhys” made peace with King John. The Chronicle of the Princes of Wales records that "young Maelgwn son of Maelgwn son of Rhys burned Aberteivi to the gate of the castle…and from thence he came to Owain son of Gruffudd son of the lord Rhys his cousin…to fight against the castle" in 1231.
The Chronicle of the Princes of Wales records that "Owain son of Gruffudd son of the lord Rhys…died at Strata Florida on the Wednesday after the octave of the Epiphany and was buried with Rhys, son of the lord Rhys, his brother in the chapter house of the monks" in 1235. 1
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