Adda ap Iorwerth Ddu Peerage person ID=654233 Parents Angharad ferch Adda Iorwerth 'Ddu' ap Ednyfed Children Ieuan ap Adda ap Iorwerth Siblings Myfanwy ferch Iorwerth Ddû ab Ednyfed Gam of Llys Pengwern Margred ferch Iorwerth Ddû ab Ednyfed Gam ab Iorwerth Foel Partners Isabel ferch Gruffudd