Senghenydd, but lost control of his lands after the six-week siege of Caerphilly Castle and a brief battle at Castell Morgraig, a Welsh-built castle at Cefn-Onn ("Ash Ridge") which was possibly built by the Lords of Senghenydd.

It is also reputed that Ifor Bach built a medieval castle on the site that is now occupied by Castell Coch.

Llewelyn Bren was later sent as a prisoner first to Brecon and then to the Tower of London along with his family

In 1318 Llywelyn became the prisoner

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