Dadorchuddiwyd cynlluniau cerflun enfawr gwerth £395,000 y Cylch Haearn heddiw gan Ken Skates, Gweinidog y Cabinet dros yr Economi ac Isadeiledd, a gallai fesur hyd at saith metr o uchder a 30 metr o led.  Mae’n cynrychioli coron enfawr rydlyd sy’n portreadu’r berthynas rhwng teuluoedd brenhinol canoloesol Ewrop a’r cestyll yr adeiladon nhw.
The £395k monumental Iron Ring sculpture, plans for which have been unveiled today by Ken Skates, Cabinet Secretary for Economy and Infrastructure, could potentially measure up to seven metres high and 30 metres wide, and symbolises a giant rusted crown representing the relationship between the medieval monarchies of Europe and the castles they built.