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The death of Gilbert de Clare, the Lord of Glamorgan and the most prominent landowner in the south, at the battle of Bannockburn in June 1314, left a power vacuum in the region, and the heavy-handed response of the English Crown towards overseeing de Clare's lands there, combined with the death of several hundred men of Glamorgan at Bannockburn, precipitated a revolt in the lordship in late summer of that year.
In the 13th century the castle would have stood on the border between the Welsh Lordship of Senghenydd and the English Lordship of Glamorgan.
One explanation is the legend of the Twelve Knights of Glamorgan, which dates from the 16th century, in which the Welsh Prince Iestyn ap Gwrgan (Jestin), prince or Lord of Glamorgan, supposedly called in the assistance of Robert Fitzhamon.