Cynan Garwyn ap Brochwel 
Cynan's father was King of Powys Brochwel Ysgithrog ap Cyngen and his mother was Arddyn Benasgel verch Pabo. His paternal grandparents were King of Powys Cyngen Glodrydd and Tudlwystl verch Brychan; his maternal grandparents were Pabo Post Prydain and <Unknown>. He had a brother named Tysilio. He died in 0610 in Powys, Wales.1 General Notes
Cynan Garwyn has little more recorded of him than his name and that he was the ruler of lands in the Kingdom of Powys, Wales in the 7th century. Even those records are in poetry or manuscripts written more than two hundred years after he is thought to have lived.
He is thought to be the eldest son of Brochwel Ysgithrog and father of Selyf Sarffgadau, and usually considered as a Prince of Powys who held authority for a period between those two. Some genealogies record that he married Gwenwynwyn 'of the Scots'.
It is sometimes argued that he died with his son at the Battle of Chester in circa AD 613 but any precise description would be based more on the desire to create a myth of the foundation of a dynasty or legend of Powsyian glory than on available evidence.
(Wikipedia)
Details of Cynan's family with Gwynwenwen of Dalriada
1 http://wc.rootsweb.com/cgi-bin/igm.cgi?op=PED&db=arciek&id=I29791&style=TABLE
Further source/citation:
http://wc.rootsweb.com/cgi-bin/igm.cgi?op=GET&db=arciek&id=I29792
Further source/citation:
http://wc.rootsweb.com/cgi-bin/igm.cgi?op=GET&db=arciek&id=I29792
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