The chapel in the triangular square was built by the citizens of Moson in honour of St. Sebastian, St. Roch and St. Rozalia, probably in fulfilment of a vow they had made during the plague of 1713.
It was enlarged in the second half of the 18th century when the altar was also built. A wooden tower was built over the façade. The chapel was renovated in 1902-1903 and a new masonry tower was added. At the turn of the century, stained-glass windows were added: the nave was decorated with ornamental ornaments, and the sanctuary was decorated with a glass image of an angel blowing a trumpet. The main façade's wall windows feature the names of World War II heroes engraved on panels. In 2001, the stolen Baroque altarpiece was replaced by a new painting of Saint Rozalia.