Gruffydd ap Madog Fychan Welsh prince, grandson of Madog Crupl, born c. 1320 Parents Madog Fychan Gwenllian verch Ithel Fychan Children Gruffudd Fychan II Isabel ferch Gruffudd ap Madog Fychan ap Madog Crupl Siblings Gruffudd of Rhuddallt