The Gwentian Chronicle records that "Elen wife of Hywel the Good" died in 943. 1
Marriage Information:
Elen married Hywel "Dda" ap Cadell, son of Cadell ap Rhodri, King of Seisyllwg, and Rheingar, about 904. (Hywel "Dda" ap Cadell was born in 887 in Wales and died in 950.)