King of Gwynedd, Wales Cadwallon (Lawhir, Long Hand) ap Einion & Meddyf verch Maeldaf 
They had a son named The Tall.
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Personal Details
King of Gwynedd, Wales Cadwallon (Lawhir, Long Hand) ap Einion
Cadwallon, known as Lawhir, Long Hand, was born in 0460 in Wales.1 He died at the age of 74 in 0534.1
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Children
King of Gwynedd Maelgwn (The Tall) Gwynedd ap Cadwallon
Maelgwn, known as The Tall, was born in 0480 in North Wales.2 He died at the age of 67 in 0547.2
1 http://wc.rootsweb.com/cgi-bin/igm.cgi?op=PED&db=arciek&id=I09919&style=TABLE
2 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=PED&db=arciek&id=I09915&style=TABLE