The Case in Brief
The Fortress an O’Donnell Chieftain Burned Rather Than Lose Donegal Castle sits right in the middle of its town, a blunt grey tower rising…
The Fortress an O’Donnell Chieftain Burned Rather Than Lose
Donegal Castle sits right in the middle of its town, a blunt grey tower rising over a bend in the River Eske, close enough to the Diamond that you could walk from your morning coffee to its gatehouse in under five minutes.
It doesn’t look haunted so much as stubborn, a fortress that has been built, held, besieged, deliberately burned by its own family, rebuilt as an English manor, fought over twice more, and finally handed to the state as a ruin. That last part matters more than it sounds. Somewhere in the gap between “built” and “burned by its own family” is a story that locals still tell as the reason to listen, at night, for a voice carried across the water.
A Fort Older Than Its Name
The town and county both take their name from the Irish Dún na nGall, the “Fort of the Foreigners,” and the name is considerably older than the stone castle visitors tour today. Historians researching the site in the nineteenth century traced it to an earlier earthwork fort on the same ground, most likely raised by Norse settlers before the twelfth century, since medieval Irish annalists reserved the term Gaill, “foreigners,” specifically for Viking raiders in this period.
The Annals of Ulster record that this earlier fort was burned in 1159 by Murtogh MacLoughlin, head of the northern Uí Néill dynasty, a full three centuries before an O’Donnell ever laid a stone of the castle that stands now.
The O’Donnells Build a Fortress for Their Descendants
The stone castle itself dates to 1474, built by Hugh Roe O’Donnell, son of Niall Garve O’Donnell and chief of the O’Donnell lordship of Tyrconnell, which covered roughly what is now County Donegal. The Annals of the Four Masters record his death in 1505, after a forty-four-year reign, and state plainly that he was the first to erect a castle here to serve as a fortress for his descendants; the same annals credit him with founding a Franciscan friary nearby around the same time, where he was buried.
It’s worth being precise about who this is, because a much more famous O’Donnell shares his first name: this Hugh Roe, the castle’s builder, died in 1505, a full century before Red Hugh O’Donnell, the Nine Years’ War commander most people picture when they hear the name, was even born.
The castle became the chief seat of the O’Donnell lords, and it didn’t take long for it to become the stage for family conflict as well as state occasions. Scholarly accounts of the site note that by 1564 the annals describe both an “old castle” and a “new tower” at Donegal, and that a succession dispute between rival O’Donnell cousins, Hugh, who held the tower, and Con, son of Calvagh, who tried to seize both structures at once, played out here before Con was captured by a rival Ulster lord and the crisis passed.
Siege, Fire, and a Chieftain’s Last Stand
The castle’s most dramatic chapter belongs to the Nine Years’ War, the Gaelic confederacy’s rebellion against the Tudor crown, and specifically to the year 1601. By then, Niall Garve O’Donnell, a rival claimant to the O’Donnell chieftainship and a distant cousin of the wartime leader Red Hugh O’Donnell, had defected to the English side.
Sir Henry Docwra, commanding the crown’s forces at nearby Lough Foyle, sent Niall Garve and hundreds of English soldiers to occupy Donegal, where they took up positions in the O’Donnells’ Franciscan friary across from the castle. Red Hugh, returning from campaigning in Connacht, besieged them there through August and September, cutting off their food and their cattle.
On the morning of September 19, 1601, fire broke out in the friary, whether by accident or design was never determined, and spread to the garrison’s store of gunpowder. The explosion killed and wounded dozens of soldiers and destroyed much of the defenders’ food, money, and supplies; one contemporary Irish chronicler described the blast hurling stones, timber, and men into the air together.
Red Hugh’s forces stormed the breach that followed, and a fierce fight for the garrison’s storehouse ended only when Niall Garve’s men and the English defenders managed to drive them back. Red Hugh lifted the siege soon after, called away by news that a Spanish fleet had landed at Kinsale to support the Irish cause.
It’s what happened next to the castle itself, not the friary, that gives Donegal its darkest and strangest historical footnote. A contemporary bardic poem, composed on the destruction of Donegal Castle and addressed directly to its ruins, states that O’Donnell did not leave his home territory for the last time until he had reduced his own ancestral fortress to rubble, so that it would never serve, in the poem’s words, as “a fortress for strangers.”
An earlier report reaching the Dublin government in 1588 had already claimed the O’Donnells intended to burn the castle rather than let the English hold it, and the poem’s own editor has suggested the actual burning might date to 1595, during an earlier campaign when O’Donnell forces torched Sligo Castle and other strongholds across north Connacht.
The precise date isn’t settled by surviving records, but the tradition is consistent on the essential point: an O’Donnell chieftain looked at the family seat his ancestor had built to shelter his descendants, and chose to destroy it himself rather than see it garrisoned by someone else’s soldiers.
Red Hugh never returned to find out what became of the ruin. He marched south to join the Spanish at Kinsale, was routed there alongside his ally Hugh O’Neill in the battle that effectively ended the Nine Years’ War, and sailed for Spain to plead for a second Spanish expedition. He died there in September 1602, still in exile.
It was his brother, Rory O’Donnell, who inherited the title Earl of Tyrconnell and who, six years later, sailed away from Ulster for good as one of the two earls at the center of the 1607 Flight of the Earls, an event sometimes mistakenly attributed to Red Hugh himself, who had already been dead for five years by then.
A Jacobean Manor Grows From the Ruin
Whether Rory O’Donnell ever repaired the castle during his brief tenure is unknown, but by 1610 an English planter, Sir Basil Brooke, was in charge of its garrison; he received a long lease in 1620 and a permanent grant of the property in 1623.
Rather than clear the old O’Donnell tower house and start fresh, Brooke built onto and around it, inserting large mullioned and transomed windows in the fashionable early seventeenth-century style, adding a magnificent fireplace on the second floor carved with his own coat of arms alongside his wife’s family crest, and topping the tower with curious projecting turrets carried on carved corbels, positioned to impress anyone approaching the entrance below. He also added an entirely new three-story wing to the southeast, giving the castle a grander entrance and far more living space for his household. Knighted in 1616, Brooke died in 1633 still in residence.
His son, Sir Henry Brooke, held Donegal Castle for the Crown during the 1641 rebellion, as part of the Laggan force defending northwest Ulster. The castle changed hands twice more during the turmoil of the following decade: captured in May 1651 by the Marquess of Clanricarde’s Confederate and Ulster forces, then abandoned as Cromwellian troops under Sir Charles Coote advanced, passing into Coote’s control.
No one used it as a residence again. It sat in slow decay, eventually passing into the ownership of the Gore family, Earls of Arran, before being donated to the Irish state in 1898. The Office of Public Works carried out an extensive restoration and partial rebuilding between 1991 and 1996, which is substantially the castle visitors walk through today.
Why Donegal Castle Is Considered Haunted
Red Hugh’s Cries From Spain
The castle’s best-known legend ties directly back to the man who burned it. According to local tradition, people standing near the castle and the River Eske at night have reported hearing a man’s anguished cries carried across the water, said to belong to Red Hugh O’Donnell himself, still calling out from his exile and death in Spain, unable to return to the fortress his family built for their descendants and that he chose to destroy with his own hand rather than let it fall to strangers.
It’s a haunting that fits its history unusually well. The bardic poem written for the ruined castle in 1601 already reads like a lament for something more than stone, addressing the fortress directly and mourning its “towering battlements” and “bright walls” as though the building itself grieved its own destruction. Whether or not you put stock in voices over water, it’s not hard to see why a story about a chieftain’s ghost, still crying out from across the sea toward the home he destroyed and never saw again, took root here and stayed.
A History Restless Enough to Speak For Itself
Beyond that specific legend, Donegal Castle doesn’t have the long catalogue of named apparitions and documented sightings that some Irish castles accumulate, and it’s worth being straightforward about that rather than inventing a busier ghost story than the record supports.
What it has instead is a genuinely violent and unsettled history packed into a small footprint: a Norse fort burned in 1159, a stone castle deliberately destroyed by its own builder’s descendant in the middle of a doomed rebellion, a fireplace still bearing the arms of the planter family that rebuilt it, and two more sieges before the seventeenth century was out. Visitors and local guides often point to that accumulated weight of conflict as reason enough for the castle’s reputation, even without a long list of confirmed encounters to point to.
The Legend
At night, people standing near the castle and the River Eske have reported hearing a man’s anguished cries carried across the water — said to belong to Red Hugh O’Donnell himself, still calling out from his exile and death in Spain.
The Record
Donegal Castle doesn’t have the long catalogue of named apparitions other Irish castles accumulate. What it has instead is a genuinely violent history: a Norse fort burned in 1159, a stone castle deliberately destroyed by its own builder’s descendant, and two more sieges before the 1600s were out.
Visiting Donegal Castle Today
Donegal Castle stands on Castle Street in the heart of Donegal Town, a short walk from the Diamond and easy to pair with a visit to the ruined Donegal Abbey across the river, the site of the 1601 siege. The castle is managed by the Office of Public Works as a state heritage site.
Inside the restored tower house and Brooke’s Jacobean wing, look for the great second-floor fireplace carved with the Brooke coat of arms, the barrel-vaulted ground floor, the tower’s original defensive features including a blocked gun loop and a stairwell likely designed to guard against attackers, and furnished rooms, including tapestries and a restored great hall, that evoke both the O’Donnell period and Brooke’s later occupation.
As of 2026, the castle is open daily, though hours can shift seasonally, and admission runs a few euro for adults with reduced rates for seniors, children, and families. Given how much visiting information at Irish OPW sites can change with the season, it’s worth checking current hours and admission directly with Heritage Ireland before you go.
Have you stood by the Eske at night and heard something you couldn’t quite place? Let us know in the comments below.
Sources consulted for the historical details in this post include P., “The Castle of Donegal,” The Irish Penny Journal*, Vol. 1, No. 24 (Dec. 12, 1840), pp. 185–187 (accessed via JSTOR); T. E. McNeill and M. A. Wilkin, “Donegal Castle,”* Ulster Journal of Archaeology*, Third Series, Vol. 58 (1999), pp.
81–89 (accessed via JSTOR); Matthew McGinty, “Red Hugh O’Donnell, Niall Garbh O’Donnell and the Siege of Donegal Abbey,”* Tales from Early Modern Ireland (Nov. 29, 2024); Wikipedia’s entries on Donegal Castle, Red Hugh O’Donnell, and Rory O’Donnell, 1st Earl of Tyrconnell; and the Heritage Ireland / Office of Public Works Donegal Castle visitor page for current visiting information.
