King of Gwynedd Maelgwn (The Tall) Gwynedd ap Cadwallon & Gwallwen verch Afallach 
The Tall and Gwallwen were married in 0523. They had a son and a daughter, named The Tall, Hir and verch Maelgwn.
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Personal Details
King of Gwynedd Maelgwn (The Tall) Gwynedd ap Cadwallon
Maelgwn, known as The Tall, was born in 0480 in North Wales.1 He died at the age of 67 in 0547.1
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Children
King of Gwynedd, Wales Rhun (The Tall, Hir) ap Maelgwn
Rhun, known as The Tall, Hir, was born in 0492 in Wales.1 He died at the age of 94 in 0586.1
1 http://wc.rootsweb.com/cgi-bin/igm.cgi?op=PED&db=arciek&id=I09915&style=TABLE
2 http://wc.rootsweb.com/cgi-bin/igm.cgi?op=GET&db=arciek&id=I09919
2 http://wc.rootsweb.com/cgi-bin/igm.cgi?op=GET&db=arciek&id=I09919