Milltown Pass was valued at £8 at the time of Griffith's Valuation. It was leased by Bartholomew O'Brien from the Talbot estate. The Talbots appear to have leased the townland from Thomas and William Jefferson. A corn mill existed at the site in the 1830s but this is described as 'in ruins' on the 25-inch Ordnance Survey map of the 1890s. The house continued to be occupied by the O'Brien family including Thomas O'Brien, first chairman of Roscommon County Council. Local sources indicate that it was the home of George King in the 1840s. The house later became known as St. Ruths. A modern house occupies the site now.