Ithel Fychan, lord of Mostyn Parents Gwladus ferch Gruffudd ap Llywelyn Rhys Fychan ap Rhys Mechyll ap Rhys Grûg ap Lord Rhys of Dinefwr, aka Rhys Ieuanc Children Margred ferch Llywelyn ap Dafydd Dinlaes ap Dafydd of Tegeingl cantref Siblings Margred (2) ferch Rhys Ieuanc ap Rhys Mechyll ap Rhys Gryg Margaret ferch Rhys Ieunac NN ferch Rhys Ieuanc ap Rhys Mechyll