The St. Remigius Church is one of the earliest Merovingian church foundations on the Middle Rhine. Its documentary evidence dates back to the year 741. Archaeological excavations from 2010 to 2013 confirmed its establishment in the second half of the 7th century. The 23-meter-long stone building was erected on an existing Merovingian burial ground and initially served as a cemetery church for the nearby settlement.
The discovery of a rare early medieval baptismal font in the church tower suggests that the church received the status of a parish church shortly after its construction.
After the construction of the Ingelheim Imperial Palace at the end of the 8th century, Charlemagne (747/48−814) and his successors used the St. Remigius Church, located 400 meters away, as a palace church. The representative sacred building provided sufficient space for church synods or festive coronations. At the palace itself, there existed only a small chapel (three-apse church) for about 200 years. A central, large church building was not established at the Imperial Palace until the 10th century with the construction of the hall church.
Today, only underground remnants of the Merovingian church can be found. The tower dates from the 12th/13th century, and the Baroque church nave was built in 1739/40. The baptismal font can be viewed as part of guided tours.