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Gadeon appears in the Dream of Macsen Wledig as brother of King Conan Meriadoc of Dumnonia & Brittany, though he actually seems to have been his son by St. Ursula, presumably born in Rome. Upon the death of his father, Gadeon inherited a position of some power and influence in the Civitas Dumnoniorum, his mother's homeland, while his half-brother, Gradlon (alias Urban), took on Armorica (Brittany). He may have become the decurion of Isca Dumnoniorum (modern Exeter), where he probably died around AD 405. His place in society was inherited by his son, Guoremor.