Rev. William McKennan, the ancestor of the McKennan family, of Washington, Pennsylvania, came to America about 1750. He was born of Scotch lineage in the north of Ireland, in 1719. He was licensed by the Newcastle Presbytery before May, 1752, and was sent by the Synod of Philadelphia to supply North and South Mountains, Timber Grove, North River and Cook's Creek, and at John Hinson's in Virginia. He spent seven or eight months in the south. Before May, 1756, he was settled at Wilmington and Red Clay. He resigned the charge of the First Presbyterian Church of Wilmington in 1794, but continued at Red Clay until his death. He was venerated for his years and his piety. He died at Red Clay, Pennsylvania, in 1809, and is buried in the Red Clay Creek burying ground. He married --- Wilson, of Winchester, Virginia.