Ieuan was the son of Llewellyn ap Maredudd and Margred verch Llewellyn. The date and place of his birth have not been found.
His wife was Mali Ddu verch Tudur. They were married, but the date and place have not been found. Their two known children were Angharad verch Ieuan (?-?) and Jenkin ap Ifan (?-?).
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