Henry Casimir de Rham was born on 15 July 1785 in Giez, Switzerland His father was Johann Christoph Wilhelm de Rham of Braunschweig, Saxony, Germany and his mother was Anne of Scottish origin. Of a robust physical appearance he attended the Military school in Munich, Bavaria. In 1803 he had opened a business in New York.Junold, Louis J. (1926),p.4 After the War of 1812 he entered business relationship with Isaac Iselin Roulet. In 1815, de Rham married Maria Theresa Moore and two of her brothers became partners in the business.Junold, Louis J. (1926),p.5 He and his wife had four children.
