The parish church of St. Quentin's is the oldest parish church in Mainz, first documented in 774. It is a hall church in the late Gothic style built between 1288 and 1330. Its belfry dates from 1489 and included a watchman's dwelling.
Today, it contains four bells, including the oldest bell in Mainz known as the "Lumpenglöckchen" a beehive bell made in 1250.
To the left of the High Altar, we find a larger than life-sized statue of St. Quentin, the patron saint of prisoners. To the right is St. Blaise, the second patron saint of the church.
The left side altar is dedicated to Judas Thaddaeus the Apostle whose miraculous image still attracts many pilgrims, especially on his feast day on 28 October. He is revered as the patron saint of desperate cases and lost causes. The large intercession book on display on the altar bears testimony to the pleas, sorrows and problems of the many believers who call on St. Jude for help.
Behind the altar, we find the chapel of the Holy Cross, containing an ancient Crucifix, depicting Jesus with a faint smile on his lips (the corpus is believed to date from the early 15th century).
