Two entries with the name Cynan.

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Cynan

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Father of Arthur’s warrior Cynlan. A mysterious figure who will come to liberate the Welsh from the English.

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Source
Culhwch and Olwen | Late 11th century

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Cynan

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Son of King Eudaf of Britain, brother of Gadeon and Elen.

Elen was married to Macsen Wledig, and together with his brother, Gadeon, they helped Macsen be restored as emperor.

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