the stellar vaulting in the narthex and the two adjacent rooms date to the first phase of building. a pointed arch portal with "verstabungen" leads to the tower staircase. the vault of the light, seven-bay nave, despite its gothic arches, is characterised by stucco in the baroque style. above the capitals of the mighty columns are free-standing acanthus branches, partition arches ("scheidbögen") and the transverse arches of the side aisles with stuccoed acanthus ornamentation.