Prince of Gwynedd Iowerth Drwyndwn ap Owain & Marared verch Madog 
Iowerth and Marared were married in 1163.
Marriage/Union Notes
M: Abt. 1163
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Personal Details
Prince of Gwynedd Iowerth Drwyndwn ap Owain
Iowerth was born in 1129 in Aberffraw Castle, Anglsy, Wales.1 He died at the age of 47 in 1176 in Aberffraw Castle, Anglsy, Wales.2
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Children
Llewelyn (The Great) ap Iorweth
Llewelyn, known as The Great, was born in 1173 in Aberffraw Castle, Aberconway, Wales.3 He died at the age of 67 on April 11th, 1240 in Aberconway, North Wales.3
1 http://wc.rootsweb.com/cgi-bin/igm.cgi?op=PED&db=tjglad&id=I68192&style=TABLE
2 http://wc.rootsweb.ancestry.com/cgi-bin/igm.cgi?op=PED&db=michaelrneuman&id=I068409&style=TABLE
3 http://wc.rootsweb.com/cgi-bin/igm.cgi?op=PED&db=tjglad&id=I67098&style=TABLE
2 http://wc.rootsweb.ancestry.com/cgi-bin/igm.cgi?op=PED&db=michaelrneuman&id=I068409&style=TABLE
3 http://wc.rootsweb.com/cgi-bin/igm.cgi?op=PED&db=tjglad&id=I67098&style=TABLE