Iorwerth ap Ednyfed Fychan Lord Abermarlais

Iorwerth ap Ednyfed Fychan's father was Ednyfed Fychan ap Kendrig Lord Brynffenigl and his mother was Tangwystl Goch verch Llywarch of Rhos. He had five brothers and two sisters, named Howel ap Ednyfed Fychan, Sir Tudor, Kendrig, Llewelyn, Rhys, Angharad and Gwenllian. He had a half-brother and two half-sisters, named Gruffydd ap Llywelyn Fawr, Gwladus Ddu "the Dark and Gwenllian.