The Protestant St. Paul's Church is the central church building in Hamm, built in the Gothic style. It is very likely that a smaller chapel or something similar existed on the same site before the actual church was built. The exact age of the current building is unknown; some sources cite the year 1275 as the year construction began. The church was built in any case in the period between the founding of the town and the separation of the parish. The sacred building was formerly called St. George and Lawrence - after the patron saints of the town. A parish was created in 1337 by separating the parish from the Pankratius Church in the village of Mark. In the meantime, the name of the church had also changed. Originally it bore the name of the patron saint of the town, St. George, but since the Reformation it has been called the "Reformed Parish Church". The name "Great Church" was not officially introduced until 1821, when the Reformed and Lutheran congregations merged. The building has only been called St. Paul's Church since 1912.