The constituent community of Eller was as early as the 5th century, in Merovingian times, the seat of a monastery consecrated to Saint Fridolin. Built onto the Late Romanesque tower is a Baroque nave with fine furnishings, among them a Stumm organ. In Saint Arnulf's Chapel across the street hangs the picture "Verspottung Christi" (“Mocking of Christ”) from the 15th century, after a drawing by Martin Schongauer. The Pyrmont and Electoral-Trier manor houses from the 16th century, today the ancestral seat of the Barons of Landenberg-Trimborn, underscore Eller's former importance.