The town church of St. Peter and Paul stands at the highest point of the town. Built around 1180 as a three-aisled basilica, it was given a high Gothic choir in 1331 in the course of various renovations. Its enormous dimensions can be explained by the active presence of the Order of St. John in the town. The patronage of St. Paul was not added until 1463.

In 1737, the baroque organ in the town church was given a new organ by Conrad Wilhelm Schäfer from Kindelbrück. The organ was tested - and this is historically documented - by Johann Sebastian Bach on December 16, 1737. A further test by Bach, then „Hochfürstlicher Capellmeister von Haus aus“, took place on July 21, 1738.

The town church of St. Peter and Paul has been restored to its medieval splendor. And so it is no wonder that the remains of „Good Conrad“ were found and reburied there. Conrad was the son of the burgomaster Berld von Sumerd. The 16-year-old is said to have been abducted to a vineyard hut in 1303, martyred there and then hanged from his own belt. This was followed by a persecution of the Jews, during which around 125 people were murdered at Weißensee Castle. The „Good Conrad“ was then venerated as a saint for around 200 years before he fell into oblivion again.

The altar of „Mary with the beard“ is particularly interesting. Before the Reformation, the gilded altarpiece depicted the coronation of Mary by Jesus Christ. After the Reformation, Jesus was given a wooden beard and became God the Father - and Marie's beard was painted on and she was then crowned as Jesus Christ.