But though we have therefore evidence that a fort or dun existed here from a very remote time, it would appear certain, from a passage in the Annals of the Four Masters, that a castle, properly so called, was not erected at Donegal by the O’Donnells till the year 1474. In this passage, which records the death of Hugh Roe, the son of Niall Garve O’Donnell, at the year 1505, it is distinctly stated that he was the first that erected a castle at Donegal, that it might serve as a fortress for his descendants; and that he also erected as it would appear, at the same time, a monastery for Observantine Franciscans near the same place, and in which he was interred in the seventy-eighth year of his age, and forty-fourth of his reign. From this period forward the Castle of Donegal became the chief residence of the chiefs of Tirconnell, till their final extinction in the reign of James I., and was the scene of many a petty domestic feud and conflict. From a notice of one of these intestine broils, as recorded in the Annals of the Four Masters, at the year 1564, it would appear that shortly previous to that period a tower, called “the New Tower,” had been added to the older structure. This tower being at that time in the possession of Hugh, the grandson of the builder of the original castle, while the latter was inhabited by his fraternal nephews, Con, the son of Calvarch, then Prince of Tirconnell, in the absence of his father, attempted to get possession of both, and nearly succeeded, when he was made captive by O’Neill. Towards the close of the great war with the Earl of Tyrone in 1601, this castle, as well as the adjacent monastery, having been placed in the hands of the Queen’s troops, through the instrumentality of Niall Garve O’Donnell, it was besieged and taken by the celebrated leader, Red Hugh O’Donnell, who afterwards blockaded the English in the monastery, from the end of September till the end of October following. But though the besieged were reduced to the utmost extremity, in consequence of the explosion of their powder by some accident, which reduced the greater part of the monastery to ruins, they maintained their position with undaunted bravery, and O’Donnell finally raised the siege, and passed into Munster to join the Spaniards. It appears, however, from a contemporaneous poem, addressed to the ruins of this castle, a translation of which we shall presently lay before our readers, that O’Donnell did not depart from his native territory, never to return, till he had reduced the proud castle of his ancestors to a ruined pile, assigning as a reason, that it should never become what its name indicated--a fortress for strangers!