Though I’ve walked across the A4232 road bridge that crosses
the River Taff where it flows in to Cardiff Bay many times – never a pleasant
walk with all the traffic constantly flowing past at breakneck speed, I’d never
until quite recently looked at the coat of arms that adorns either side of the
bridge at both the eastern and western ends of its span.

SOUTH
GLAMORGAN COUNTY COUNCIL CYNGOR SIR DE MORGANNWG
*ARMS: Vert on a Pile reversed throughout Ermine between two Towers Or a
Roundel per pale of the last and Gules charged with three Chevronels also per
pale Gules and Argent ensigned with an ancient Crown Gold.
*CREST: Within a Mural Crown Gules a Mitre affrontée Or; Mantled Vert doubled
Argent.
*SUPPORTERS: On the dexter side a Dragon and on the sinister side a winged Lion
both Gules and each supporting a Trident Or.
*BADGE: Within an Annulet ensigned by a Mural Crown three Chevronels all Or.
Motto 'Y DDINAS A'R FRO' - The City and the Vale.
That website includes a coloured image of the coat of arms but I also located one on Wikimedia that shows the coat of arms more clearly and is free to use under Creative Commons Attribution-Share Alike 4.0 International license. It is shown below. And if you want to try to decipher the heraldry jargon, there’s a beginner’s guide on The Heraldry Society’s website.
South Glamorgan County Council was active from 1974 to 1996,
and consisted of Cardiff, which is now its own district; parts of south
Glamorgan, which are now included in the Vale of Glamorgan district; and St
Mellons, which is now in Monmouthshire.
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