The former French Catholic diocese of Saint-Omer existed from 1559Saint-Omer (Diocese) [Catholic-Hierarchy] until the French Revolution, with its episcopal seat in Saint-Omer Cathedral in Saint-Omer, in the modern department of Pas-de-Calais The diocese was created as a reaction to the destruction of the see of Thérouanne by military action in the wars of the Emperor Charles V. It then became a suffragan of the Archdiocese of Cambrai in 1559.
By the Concordat of 1801, the diocese of Saint-Omer was united with the diocese of Arras and the diocese of Boulogne, to form an enlarged diocese of Arras.Catholic Encyclopedia: Arras
Bishops Guillaume de Poitiers 1561 Gérard de Haméricourt 1563-1577 Jean Six 1581-1586 Jacques de Pamèle 1587 Jean de Vernois, O.P., 1591-1599 Jacques Blaseus, O.F.M. Rec., 1600-1618 (previously bishop of Namur) Paul Boudot 1618-1626 (then bishop of Arras) Pierre Paunet, O.F.M., 1628-1631 Christophe de Morlet 1632-1633 Christophe de France 1635-1656 Ladislas Jonart 1662-1671 (then archbishop of Cambrai) Jacques-Théodore de Bryas 1672-1675 (then archbishop of Cambrai) Jean Charles de Longueval 1676 Pierre Van Den Perre 1577 Armand-Anne-Tristan de La Baume de Suze 1677 Louis-Alphonse de Valbelle 1677-1708 (previously bishop of Alet) François de Valbelle de Tourves 1708-1727 Joseph-Alphonse de Valbelle de Tourves 1727-1754 Pierre-Joseph de Brunes de Monlouet 1754-1765 (previously bishop of Dol) Louis-François-Marc-Hilaire de Conzié 1766-1769 (then bishop of Aire) Joachim-François-Mamert de Conzié 1769-1775 (then archbishop of Tours) Jean-Auguste de Chastenet de Puységur 1775-1778 (then bishop of Carcassonne) Alexandre-Joseph-Alexis de Bruyère de Chalabre 1778-1790 (1796)
See also Catholic Church in France List of Catholic dioceses in France
Notes
Bibliography
Cochin, Claude (1905). "Recherches sur Stefano Colonna, prévôt du chapitre de Saint-Omer, cardinal d'Urbain VI et correspondent de Pétrarque," Revue d' histoire et de littérature religeuses 10 (1905) 352-383; 554-578.
pp. 548–549. (Use with caution; obsolete) p. 301. (in Latin) p. 175.
p. 219.