 In 1913, the Archdiocese of Cambrai was split to create the diocese of Lille, with the basilica serving as its new cathedral.In 2008, following the reorganization of the ecclesiastical provinces of France, the diocese of Lille was elevated to the status of metropolis and the cathedral became a metropolitan cathedral, seat of the Archbishop of Lille.The cathedral owes its name to a statue of the Virgin Mary, known as Our Lady of the Treille, which was housed at the Collegiate Church of St. Peter from the beginning of the 13th century and has since been the object of devotion and veneration.