Patrick Hagan, born in 1828, emigrated from Dungannon, Ireland, about 1844 and joined his uncle, Joseph Hagan, in Scott County. He read law, was admitted to the bar, and became one of the state’s foremost land lawyers. Hagan amassed large holdings of coal and timber lands, including Osborne’s Ford, as it had been called since 1786, when Stephen Osborne obtained a land grant. He renamed the community for his birthplace, and it grew rapidly after the Clinchfield Railroad built a depot in 1912. Hagan also designed the town plan, and Dungannon was incorporated in 1918.