King Llywelyn Ap Seisyll Of Gwynedd Powys And Deheubarth
- Born: Rhuddlan, Flintshire, Wales
- Marriage (1): Angharad ferch Maredudd in 994 in Wales
- Died: 1023, Rhuddlan, Flintshire, Wales
- Buried: After 23 Oct 1023, Pentrefoelas, Denbighshire, Wales
FamilySearch ID: 9376-JCH.
Llywelyn married Angharad ferch Maredudd, daughter of Maredudd ab Owain and Nest ferch Owain, in 994 in Wales. (Angharad ferch Maredudd was born about 982 in Dinefwr Castle, Carmarthenshire, Wales, died on 8 May 1058 in Castle, Montgomeryshire, Wales and was buried in 1058.)
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