Llewelyn (The Great) ap Iorweth & Joan Plantagenet 
The Great and Joan were married on April 16th, 1205.1 They had three sons and four daughters, named Dafydd, Tegwared-Y-Baiswen, Llywelyn, Angharad, Elen, Margred and Helen.
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Personal Details
Llewelyn (The Great) ap Iorweth
Llewelyn, known as The Great, was born in 1173 in Aberffraw Castle, Aberconway, Wales.1 He died at the age of 67 on April 11th, 1240 in Aberconway, North Wales.1
Joan Plantagenet
Joan was born on July 22nd, 1190 in Neward Castle, Nottinghamshire, England.1 She died at the age of 45 on March 30th, 1236 in Court of Aber, Aberconwy, Arllechwedd Isaf, Caernarvonshire, Wales.1
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Children
Princess of North Wales Elen ferch Llewelyn
Elen was born in 1206 in Caernarvonshire, Wales.3 She died at the age of 47 on October 25th, 1253 in Chester, Cheshire, England.3
Margred Verch Llwelyn
Margred was born in 1210 in Caernarvonshire, Wales.1 She died at the age of 53 in 1263 in Clifford Castle, Clifford, Hertfordshire, England.4
1 http://wc.rootsweb.com/cgi-bin/igm.cgi?op=PED&db=tjglad&id=I67098&style=TABLE
2 http://wc.rootsweb.com/cgi-bin/igm.cgi?op=GET&db=tjglad&id=I68192
3 http://wc.rootsweb.ancestry.com/cgi-bin/igm.cgi?op=PED&db=bevangenealogy&id=I32680&style=TABLE
4 http://wc.rootsweb.com/cgi-bin/igm.cgi?op=PED&db=arciek&id=I27197&style=TABLE
5 http://wc.rootsweb.com/cgi-bin/igm.cgi?op=GET&db=tjglad&id=I65434
2 http://wc.rootsweb.com/cgi-bin/igm.cgi?op=GET&db=tjglad&id=I68192
3 http://wc.rootsweb.ancestry.com/cgi-bin/igm.cgi?op=PED&db=bevangenealogy&id=I32680&style=TABLE
4 http://wc.rootsweb.com/cgi-bin/igm.cgi?op=PED&db=arciek&id=I27197&style=TABLE
5 http://wc.rootsweb.com/cgi-bin/igm.cgi?op=GET&db=tjglad&id=I65434