City of Hyden. Hyden, the county seat of Leslie County, was founded in 1878 and named for State Senator John Hyden. Due to its inaccessibility, Mrs. Breckinridge felt that Hyden would be the perfect place to start her demonstration project of the Frontier Nursing Service. She felt that if the work could be done there, it could be duplicated anywhere else in the United Stated with less effort. The campus of Frontier Nursing University is located on a narrow bench of Thousandsticks Mountain above Hyden.