Joane De Clare 
She had a biological son named Rhys Mechyll ap.
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Children
Rhys Mechyll ap Rhys , Lord of Cantref Mawr
Rhys Mechyll ap was born in 1200. He died at the age of 44 in 1244.
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Joane De Clare Rhys Mechyll ap Rhys , Lord of Cantref Mawr