Sesiwn gan Delwyn Siôn i nodi Radio Cymru'n chwarae Plas y Brenin gan Hergest ar fore'r 3ydd o Ionawr 1977. On Radio Cymru's 40th birthday, Delwyn Siôn join Shân. Show more
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Sesiwn gan Delwyn Siôn i nodi Radio Cymru'n chwarae Plas y Brenin gan Hergest ar fore'r 3ydd o Ionawr 1977. On Radio Cymru's 40th birthday, Delwyn Siôn join Shân. Show more
Mae Radio Cymru wedi bod yn darlledu rhaglenni ers 1977. Radio Cymru has been broadcasting to the nation since 1977.
