The current appearance of the chapel is due to the interventions directed in the last years of the nineteenth century by Luca Beltrami, as part of a larger restoration project of the building that later involved in an incisive way especially the facade.
Beltrami is responsible for the relocation of the sarcophagus of Theodolinda against the background wall (after the removal of the large baroque altar that had partially affected the painted decoration), the project of the reliquary altar of the iron crown (partly financed by the Royal House), the new floor (designed by Augusto Brusconi) and the large iron railing that replaced the previous balustrade.
On this occasion, the first systematic photographic campaign of the pictorial cycle was also carried out by the photographer from Monza Carlo Fumagalli (later owner with Gigi Bassani of the Montabone studio in Milan), which served as the basis for the first modern monograph on the chapel, prepared by Fumagalli himself with the collaboration of Luca Beltrami (1891).
