County Donegal: History
County Donegal was the home of the once-mighty Clann Dálaigh, whose best-known branch was the Clann Ó Domhnaill, better known in English as the O'Donnell dynasty. Until around 1600, the O'Donnells were one of Ireland's richest and most powerful native Irish ruling families. Within Ulster, only the Uí Néill (known in English as the O'Neills) of Tír Eoghain (Tirowen or modern Tyrone) were more powerful. The O'Donnells were Ulster's second most powerful clan or ruling family from the early 13th century through to the start of the 17th century. For several centuries, the O'Donnells ruled Tír Chonaill (Tyrconnell), a túath or Gaelic kingdom in west Ulster that covered almost all of modern County Donegal. The head of the O'Donnell family had the titles An Ó Domhnaill (meaning The O'Donnell in English) and Rí Thír Chonaill (meaning King of Tír Chonaill in English). Based at Donegal Castle in Dún na nGall (modern Donegal Town), the O'Donnell Kings of Tír Chonaill were traditionally inaugurated, from the 1460s onwards, at Doon Rock near Kilmacrennan. The O'Donnells' royal or chiefly power was finally ended in what was then the newly created County Donegal in September 1607, following the Flight of the Earls from Portnamurray, near Rathmullan. The modern County Arms of County Donegal (dating from the early 1970s) was influenced by the design of the old O'Donnell royal arms. The County Arms is the official coat of arms of both County Donegal and Donegal County Council.
The modern County Donegal was made a shire by order of the English Crown in 1585. The English authorities at Dublin Castle formed the new county by amalgamating the old Kingdom of Tír Chonaill with the old Lordship of Inishowen. Although detachments of the Royal Irish Army were stationed there, the Dublin authorities were unable to establish control over Tír Chonaill and Inishowen until after the Battle of Kinsale in 1602. Full control over the new County Donegall was only achieved after the Flight of the Earls in September 1607. It was the centre of O'Doherty's Rebellion of 1608, with the key Battle of Kilmacrennan taking place there. The county was one of those 'planted' during the Plantation of Ulster from around 1610 onwards. What became the City of Derry was officially part of County Donegal up until 1610.
County Donegal was one of the worst-affected parts of Ulster during the Great Famine of the late 1840s in Ireland. Vast swathes of the county were devastated, with many areas becoming permanently depopulated. Vast numbers of County Donegal's people emigrated at this time, chiefly through Foyle Port.
During the Irish Civil War (1922–1923), Donegal played a strategic role due to its proximity to Northern Ireland, where anti-Treaty forces often sought refuge and resupplied. The county's rugged landscape, including areas like Dunlewey, provided ideal terrain for guerrilla operations and hiding arms caches. Local communities were divided in their loyalties, with some supporting anti-Treaty forces by offering shelter and supplies, while Free state forces carried out raids to suppress resistance.
The Ballymanus mine disaster occurred on 10 May 1943 on a beach at Ballymanus, County Donegal, when local villagers attempted to bring ashore an unexploded marine mine. Eighteen men and boys between the ages of 13 and 34 were killed in the explosion. …