The Diocese of Tournai () is a Latin Church ecclesiastical territory or diocese of the Catholic Church in Belgium. The diocese was formed in 1146, upon the dissolution of the Diocese of Noyon and Tournai, which had existed since the 7th century. It is now suffragan in the ecclesiastical province of the metropolitan Archdiocese of Mechelen–Brussels. The cathedra is found within the Cathedral of Notre-Dame de Tournai, which has been classified both as a major site for Wallonia's heritage since 1936 and as a World Heritage Site since 2000.
History
As early as the second half of the 3rd century St. Piat evangelized Tournai; some sources name him as the first bishop, but this remains unsubstantiated. At the end of the 3rd century Emperor Maximian rekindled persecutions, and St. Piat was martyred as a result.
Barbarian invasions began shortly afterwards. These lasted from the end of the 3rd century till the end of the 5th century. St. Remigius used the good-will of the Frankish monarchy to organize the Catholic hierarchy in the North of Gaul. He confided the Diocese of Arras and Cambrai to St. Vaast (Vedastus), and founded the See of Tournai (c. 500), appointing as its titular Eleutherius.
It was probably its status of royal city which secured Tournai's early rise, only to lose its position as capital upon the departure of the Merovingian court. Nevertheless, it maintained its own bishops for nearly a century. Then, at about 626 or 627, under the episcopate of St. Achar, the sees of Tournai and Noyon were reunited, retaining however their separate structures. Tournai lost its privileges and was relegated to level of the neighbouring dioceses, such as Boulogne and Therouanne, Arras and Cambrai. The same ordinary held both sees for five hundred years. It was only in 1146 that Tournai received its own bishop.
Notable bishops are: St. Eleutherius (beginning of 6th century); St. Achar (626/27 – 1 March 637/38); St. Eloi (641–660); Simon de Vermandois (1121–1146); Walter de Marvis (1219–1251), the great founder of schools and hospitals; Etienne of Tournai (1192–1203), godfather of Louis VII of France and minister to the queen; Andrea Chini Malpiglia (1334–42), cardinal and papal legate; Guillaume Fillastre (1460–1473), chancellor of the Golden Fleece; Michel de Warenghien (1283–1291), a very erudite doctor; Michel d'Esne (1597–1614), the author of several works. Raphael de Mercatellis (1487–1507), illegitimate son of Philip the Good and noted bibliophile, was auxiliary bishop of Tournai.
During Spanish rule (1521–1667) the see continued to be occupied by natives of the country, but the seize of Tournai by Louis XIV in 1667 caused it to have a number of Frenchmen for bishop: Gilbert de choiseul duplessis praslin (1670–1689); François de La Salle de Caillebot (1692–1705); Louis Marcel de Coëtlogon (1705–1707); François de Beauveau (1708–1713). After the Treaty of Utrecht (1713) the French were replaced by Germans: Johann Ernst, Count of Löwenstein-Wertheim (1713–1731); Franz Ernst, Count of Salm-Reifferscheid (1731–1770); Wilhelm Florentine, Prince of Salm-Salm (1776–1794).
The reunion of the see with Noyon and the ensuing removal of the seat of the bishopric bolstered the chapter. The chapter's requirement to appoint only nobility and scholars, as set forth by the old régime, tended to attract the highly born and educated. Illustrious French and Belgian names are inscribed in the archive's registers and on the cathedral's tombstones. The cathedral, long by wide, is surmounted by 5 towers high. The nave and transept are Romanesque (12th century), while the choir is primary Gothic, begun in 1242 and completed in 1325.