Efa was the daughter of Iorwerth ap Gruffydd and Tangwystl verch Gruffudd. The date and place of her birth have not been found.
Her husband was Ieuaf ap Llewellyn. They were married, but the date and place have not been found. Their three known children were Margred verch Ieuaf (?-?), Lleucu verch Ieuaf (?-?) and Gwenhwyfar verch Ieuaf (c1249-?).
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Iorwerth ap Gruffydd |
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Angharad verch Dafydd |
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