Cynan Dindaethwy ap Rhodri - Cynan Dindaethwy - was King of Gwynedd (798–816) in medieval north-west Wales.
Cynan was son of Rhodri Molwynog ap Idwal and Margaret ferch Duplory and ascended to the throne of Gwynedd after first his father died and then his cousin Caradog ap Meirion, who had become king after Rhodri, died in 798.
Cynan Dindaethwy ap Rhodri was preceeded by Caradog ap Meirion (c.754-c.798) and was succeeded by Hywel Farf-Fehinog ab Caradog (Howell Greasy-Beard) (814-825). (From Wikipedia, the free encyclopedia)
CONAN TINDAYTHWY, who became King of Wales 755 and died 818. (Fenwick Allied Ancestry, page 181)