The is the parish church for Bad Schussenried and has been used by the local Roman Catholic parish since 1803. It was built in 1229 in the Romanesque style, with three aisles but no transept. It was dedicated to the Virgin Mary, but St. Magnus was added to the dedication in 1366. From 1493 to 1498, the church was reconstructed in the Gothic fashion. Seven chapels and winged altarpieces by Bernhard Strigel were added, as was a porch, in 1482, and new a choir with pointed arches in 1494. These arches were replaced in 1650 with a barrel vault, and the bell tower was enlarged over the 1620s and given with an onion dome in 1692. The church was once again remodeled in the 18th century in Baroque style. The original, flat ceiling was replaced with a vaulted one, round windows installed, and the preceding Romanesque and Gothic embellishments covered with stucco. This work revealed that bricks had been used in the previous renovation, making it some of the oldest brickwork in Upper Swabia.
