The Mellon Homestead.In 1818, a five-year-old boy emigrated to America from the house in Castletown, County Tyrone, that now forms the centrepiece of the Ulster American Folk Park (Opened 1976).That child, Thomas Mellon, went on to found what was then known as the Mellon Bank.He also was a successful lawyer and judge, and by the time of his death was one of America's wealthiest men and the patriarch of the Mellon family in Pittsburgh, Pennsylvania.The bank still exists and is known as the Bank of New York Mellon,