The city of Nancy in France, situated on the Meurthe River, bears considerable testimony to the activities of King Stanislaus Leszczynski, who settled there with his immediate entourage after going into exile. The Polish king's long stay in Lorraine resulted in some interesting polonics.

The subject of King Stanislaus Leszczynski's French artistic investments in Nancy has not yet lived to see its own monograph. The project launched in 2018, 'Nancy Stanislaus Leszczyński. A historical-architectural monograph' - carried out by Dr Paweł Migasiewicz (project leader), Dr Jakub Sito and Monika Wyszomirska M.A. - assumed full source research, a presentation of the artistic activities of the king and his court and a catalogue of works of art.

Source research carried out in 2019: iconographic, cartographic and manuscript research both in national institutions (Kraków, Warsaw, Wrocław) and in Lorraine and Paris, revealed a varying degree of preservation of archival sources. On the other hand, the materials relating to the royal foundation - the church of Notre-Dame-de-Bonsecours in Nancy - were surprisingly abundant and interesting. They have shed new light on the king's patronage and the circle of artists associated with it.

Accordingly, this work of architecture and its rich furnishings are the focus of the publication 'The Church of Notre-Dame-de-Bonsecours in Nancy. Polish Royal Mausoleum in Lorraine' published by the Polonica Institute in 2023 as part of the scientific series 'Studies and Materials'.