The bells in the belfry originally only served a religious purpose. Gradually the bells got a secular role by regulating daily life in the growing medieval city. The alarm bell Roland (an Anglicization of the Dutch name "Roeland"), which was installed in the Belfry in 1325, was also used as the hourly bell from 1378 onwards. The hourly chime was preceded by warning signals on three smaller bells with various tones. This was the predecessor of the carillon. The carillon was built by the famous bellfounders Pieter and François Hemony in the 17th century and has a total weight of 30 tons. The carillon gradually expanded to 53 bells after its restoration in 1982. In 1993 another bell, called Robert, with a clear sound was added to the carillon.