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Notes: Ceir rhai enghreifftiau o “Caer y Tŵr” o dan ddylanwad presenoldeb olion tŵr gwylio Rhufeinig ar safle’r fryngaer. Serch hynny, mae’r dystiolaeth etymolegol o blaid “Caer y Twr” a dyma arfer Cadw a Llywodraeth Cymru.