Llywelyn 'the Great' ap Iorwerth Prince of Aberffraw and Lord of Snowdonia
- Born: 1173, Dolwyddelan Castle, Dolwyddelan, Wales
- Marriage (1): Joan Princess of Wales in 1204 in England
- Marriage (2): Tangwystl verch Llywarch
- Died: 11 Apr 1240, Abbey of Aberconwy, Aberconwy, Wales at age 67
- Buried: Maenan near Llanrwst, Wales
Llywelyn married Joan Princess of Wales, daughter of King John 'Lackland' Plantagenet of England and Agatha de Ferrers, in 1204 in England. (Joan Princess of Wales was born about 1187, died in Mar 1236 in Aberconwy, Arllechwedd Isaf, Caernarvonshire, Wales and was buried in 1236 in Priory of Llanfaes near Beaumaris, Anglesey, Wales.)
Llywelyn next married Tangwystl verch Llywarch, daughter of Llywarch "Goch" ap Iorwerth Lord Of Rhos and Tangwystl verch Llywarch Of Cummwd. (Tangwystl verch Llywarch was born about 1168 in Rhos, Denbighshire, Wales.)
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