Louis William Valentine DuBourg was a French Catholic prelate and Sulpician missionary to the United States. He built up the church in the vast new Louisiana Territory as the Bishop of Louisiana and the Two Floridas and later became the Bishop of Montauban and finally the Archbishop of Besançon in France.

The Society of Priests of Saint-Sulpice, also known as the Sulpicians, is a society of apostolic life of Pontifical Right for men, named after the Church of Saint-Sulpice, Paris, where it was founded. The members of the Society add the nominal letters PSS after their names to indicate membership in the Congregation. Typically, priests become members of the Society of the Priests of St. Sulpice only after ordination and some years of pastoral work. The purpose of the society is mainly the education of priests and to some extent parish work. As their main role is the education of those preparing to become priests, Sulpicians place great emphasis on the academic and spiritual formation of their own members, who commit themselves to undergoing lifelong development in these areas. The Society is divided into three provinces, operating in various countries: the Province of France, Canada, and the United States.