Lifford (, historically anglicised as Liffer) is the county town of County Donegal, Ireland, the administrative centre of the county and the seat of Donegal County Council, although the town of Letterkenny is often mistaken as holding this role. Lifford lies in the Finn Valley area of East Donegal where the River Finn meets the River Mourne to create the River Foyle. The Burn Dale (also spelt as the Burn Deele), which flows through Ballindrait, flows into the River Foyle on the northern outskirts of Lifford. History The town grew up around a castle built there by Manghus Ó Domhnaill, ruler of Tír Chonaill (mostly modern County Donegal), in the 16th century. It later became a British Army garrison town until most of Ireland won independence as a dominion called the Irish Free State in early December 1922. It lies across the River Foyle from Strabane (in County Tyrone, Northern Ireland) and is linked to that town by Lifford Bridge. Manus O'Donnell began building the castle in 1527 on the Wednesday after St. Brendan's Day (Saint Brendan's feast day is celebrated on 16 May). He completed the masonry and woodwork by the end of that summer even though the O’Neill’s of Tír Eoghain were at war with him. In 1543 the castle of Leithbher was given to Cahir (the son of Donnell Balbh) O'Gallagher to be guarded for the O’Donnell clan. He then proceeded to banish the people loyal to the O’Donnell’s from the castle so that he could keep it for himself. In 1544 Calvagh went to the English Lord Justice, and brought back English soldiers with him to Tirconnell, the olden name for County Donegal. O'Donnell, Calvagh, and these men went with ‘ordnance and engines for taking towns’ to the castle of Lifford to take it back from the descendants of the O'Gallaghers. Cahir, the son of Tuathal Balbh & Turlough, the son of Felim Fin O'Gallagher, who had been taken hostage earlier, was brought to the castle to see if the O’Gallagher’s would surrender. Which they wouldn’t. As the English attacked one was killed instantly so they killed Cahir, the son of Tuathal on the spot. The castle was then surrendered to O’Donnell to spare the life of Turlough, the son of Felim Fin and another son of Tuathal Balbh. Lifford Castle is no longer standing but there is a poem from the late 16th century about