Mr. Riley then told him that he needed to take his eighteen slaves to his brother in Kentucky by foot. They arrived in Daviess County, Kentucky, in the middle of April 1825 at the plantation of Mr. Amos Riley. In September 1828, Henson returned to Maryland in an attempt to buy his freedom from Issac Riley.[3] He tried to buy his freedom by giving his master $350, which he had saved up, and a note promising a further $100.