The church of San Martin de Roubaix is the city's oldest church, in fact it's the oldest building, be it a home or historic building. The first church from the late ninth century was replaced by a building of three naves of which the 1511 bell tower can still seen. The industrial city grew very fast with the incredible development of the weaving sector and workers came every day to work in Roubaix. The architect Charles Leroy was asked in 1848 to enlarge the church so he conceived a building of five naves in gothic style, as you can see at the southern gate. The church of St. Martin Notre Dame has very beautiful works of art, stone sculptures of Tournai (a nearby city) and an altarpiece (the decorations around it depict St.