It was constructed with the patronage of Robert Dudley, Earl of Leicester, as part of his ambitious plans to become the most powerful man in the country, with Denbigh as the seat of his realm.
Fe'i hadeiladwyd gyda nawdd Robert Dudley, Iarll Caerlŷr, fel rhan o'i gynlluniau uchelgeisiol i ddod y dyn mwyaf pwerus yn y wlad, gyda Dinbych yn ganolfan i'w deyrnas.