Under this charter, Count Baldwin V of Flanders granted the collegiate a quarter of the former Carolingian castrum, a farm in Flers, and two-thirds of the revenues of the Annapes church; a chapter of canons was also created.

Sadly, following the Battle of Mons-en-Pévèle in 1304, Lille was sacked by Philip the Fair's army, the collegiate church was burned and the statue all but destroyed: only the head remained.

Philip the Good, Duke of Burgundy and Count of Flanders, then had the collegiate church rebuilt and the statue restored to its knees.

[6] As the collegiate church and its chapter gained in prestige, they attracted certain devotions to them, including that of Notre-Dame-des-Sept-Douleurs in the second half of the 15th century,[7] a fact addressed by the Dominican Michel François de Templemars[8] in 1495.

Devotion to Notre-Dame-des-Sept-Douleurs grew to such an extent that Popes Alexander III and Clement IX agreed to the creation of a specific office for the churches of Lille.

In 1634, Notre-Dame-de-la-Treille was named the city's patron saint and was originally officially celebrated on the Sunday after the Holy Trinity (since then, the date has been changed to October 28).

During the War of Devolution, King Louis XIV took Lille in 1667, and, wishing to reassure the natives of their privileges and freedoms, he took an oath in front of Notre-Dame de la Treille, then finalized the statue by adding two complete legs.

The remains of the Romanesque crypt of the collegiate church of Saint-Pierre are listed as historic monuments and can be accessed via a staircase from the rue du Palais de Justice.

[14] Aubin-Louis Millin, in the fifth volume of “Antiquités nationales ou recueil de monuments” published in Year VII of the Republican calendar (1799-1800), writes of the tomb of Baudouin V:Entering the church choir from the nave, we found this inscription on a flat tomb: Chy gist tres haus, tres nobles et tres poissans princes BAUDEWINS li DEBONNAIRES jadis contes de Flandres li onzieme, qui funda ceste église et trespassa en lan de grace mil LXVIII.

Although he had a chapel built next to the Notre Dame church in Courtrai for his burial, the Chapelle des Comtes, Louis de Male was not buried there.

Marguerite III of Flanders, daughter of the deceased, joined them after she died in Arras on March 16, 1405, while her husband, Philippe le Hardi, was buried at the Chartreuse de Champol in Burgundy.

The monument, which was a long square, was decorated on all four sides with 24 copper figures, eighteen inches high, depicting, surrounded by various emblems, the princes and princesses of the spouses' houses.