The paper offers a brief survey of the excavations and conservation of the ruins of the medieval provostal church of SzEkesfehErv·r, that took place between 1936 and 1938, in connection with the 900th anniversary of the death of King Saint Stephen I of Hungary, celebrated with large-scale programs in 1938 (the King was the founder of the provostship, which became the place of coronation of the medieval rulers of Hungary, and at the same time the burial-place of Saint Stephen and many of his successors). In this process the art historian Tibor Gerevich, leader of the National Office for the Protection of Historic Monuments played an important role. The building of the so called mausoleum, where the marble sarcophagus from the 11th century, considered as the monument of Saint Stephen was placed in the centre, and a semicircular-arched gallery for the purpose of a lapidary were built on the border of the excavated territory. The buildings were designed by the young architect Géza Lux, in a modest, elegant style referring to the brickwork of some Italian Romanesque churches. The ensemble is an important part of the history of monument protection in Hungary, and at the same time it offers the highest level of the official state architecture of its age.