Nivelles is a Walloon city and municipality located in the Belgian province of Walloon Brabant. The Nivelles municipality includes the old communes of Baulers, Bornival, Thines, and Monstreux. The Nivelles district includes all the municipalities in Walloon Brabant. Its Collegiate Church of Saint Gertrude has been classified as a Major Heritage of Wallonia. The collegiate church of Saint Gertrude, patron saint of the city, dates from the 11th to the 13th century and is one of the best examples of Romanesque style in Belgium. It has been classified as one of Europe's major heritage sites. Tombs from the Merovingian (7th century) and Carolingian (9th century) periods have been found under the church. The Romanesque crypt is one of the largest of its kind in Europe. The two-meter-tall statue that strikes the hours in one of the towers (French: jacquemart) is affectionately known as "Jean de Nivelles". Jean dates from around 1400.