Buncrana ( ; ) is a town in County Donegal, Ireland. It is beside Lough Swilly on the Inishowen peninsula, northwest of Derry and north of Letterkenny. In the 2016 census, the population was 6,785 making it the second most populous town in County Donegal, after Letterkenny, and the largest in Inishowen. Buncrana is the historic home of the O'Doherty clan and originally developed around the defensive tower known as O'Doherty's Keep at the mouth of the River Crana. The town moved to its present location just south of the River Crana when George Vaughan built the main street in 1718. The town was a major centre for the textile industry in County Donegal from the 19th century until the mid-2000s (decade). History O'Doherty's Keep On the northern bank of the River Crana as it enters Lough Swilly sits the three-storey O'Doherty's Keep, which is the only surviving part of an original 14th-century Norman castle. The first two levels of the keep were built after 1333. In 1601 the O'Doherty's Keep was described as being a small, two-storey castle, inhabited by Conor McGarret O'Doherty. In 1602 the third level was added and it was upgraded by Hugh Boy O'Doherty as an intended base for Spanish military aid that hoped to land at Inch. The keep was burned by Crown forces in 1608 in reprisal for the rebellion of Sir Cahir O'Doherty, who had sacked and razed the city of Derry. After Sir Cahir O'Doherty was killed at the Battle of Kilmacrennan, he was attaindered and his land seized. The keep was granted to Sir Arthur Chichester, who then leased it to Englishman Henry Vaughan, where it was repaired and lived in by the Vaughan family until 1718. In 1718, Buncrana Castle was built by George Vaughan, it was one of the first big manor houses built in Inishowen, and stone was taken from the bawn, or defensive wall, surrounding O'Doherty's Keep to build it. It was erected on the original site of Buncrana, which had grown up in the shadow of the keep. Vaughan moved the town to its present location, where he founded the current main street and built the Castle Bridge (a six-arched stone single lane bridge) across the River Crana leading to his Castle. During the 1798 Rebellion, Theobald Wolfe Tone was held in Buncrana Castle when he was captured after the British/French naval battle off the