The Basilica of Saint Nicholas is located in the Old Centre district of Amsterdam, Netherlands. It is the city's major Catholic church. Officially the church was called St. Nicholas inside the Walls, i.e. the oldest part of the Amsterdam defence works. The architect, Adrianus Bleijs (1842-1912) designed the church basing himself on a combination of several revival styles of which Neo-Baroque and neo-Renaissance are the most prominent models.