To which religious order did XXX belong?
Pierre-Jean De Smet
Pierre-Jean De Smet (30 January 1801 -- 23 May 1873), also known as Pieter-Jan De Smet, was a Belgian Roman Catholic priest and member of the Society of Jesus (Jesuits), active in missionary work among the Native Americans of the Midwestern United States, Western United States and Western Canada in the mid-19th century.
Society of Jesus