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Dr. Jaap Geraerts

Member of the academic staff
Room: 03-06, Diether-von-Isenburg-Str. 9-11, 55116 Mainz (Besucheranschrift)
Phone: +49 6131 39 26978


Personal Details:

Since February 2019: postdoctoral researcher at Leibniz Institute of European History (IEG) in Mainz (Digital Historical Research Unit | DH Lab)
2015-2019: Research associate, Centre for Editing Lives and Letters (UCL)
2013-2014: Research assistant, Centre for Editing Lives and Letters (UCL)
2010-2015: PhD in History, University College London (UCL)
2008-2010: Research MA in History, Utrecht University
2005-2008: BA in History, Utrecht University
2000-2004: BA in Business Informatics (Hogeschool van Utrecht)

Research interests:

Confessional coexistence in early modern Europe
Early modern Catholicism
Early modern nobility
History of reading


Benjamin J. Kaplan and J. Geraerts (eds.), Early Modern Toleration: New Approaches (Routledge, 2023).
Priests’ libraries in the Dutch Republic, in: R. Adams and J. Glomski (eds.), Seventeenth-Century Libraries: Problems & Perspectives (Brill, 2023), 96-120.
The Counter-Reformation on Display. Religious Art at the Estates of the Catholic Nobility in the Dutch Golden Age, in: Esther Meier and Almut Pollmer-Schmidt (eds.), Kunst & Katholizismus in der niederländischen Republik / Art & Catholicism in the Dutch Republic (Petersberg, 2023), 47-60.
Competing sacred spaces in the Dutch Republic: confessional integration and segregation, European History Quarterly 51:1 (2021), 7–44.
Patrons of the Old Faith. The Catholic Nobility in Utrecht and Guelders, c.1580–1702, Leiden 2018.

Research projects:

"Staatskatholieken en Roomskatholieken": The Catholic laity and the Schism in the Catholic Church in the Dutch Republic, 1650–ca.1750

The project focuses on processes of fragmentation and pluralisation using the example of the schism in the Catholic Church in the Netherlands. It examines the decisions of Catholic laity for one of the two competing churches and relates local patterns of intra-Catholic confessional affiliation to the general development of the schism. 

European peace treaties of the pre-modern era in data (FriVer+)

This project transformed the data, in accordance with the FAIR principles, that is made available on the website Europäische Friedensverträge der Vormoderne online. This website provides information about a total of 1800 European peace treaties that originated between 1450 and 1789. The data, comprising digital images of the peace treaties as well as metadata and, in a more limited number of cases, transcriptions and even formal editions of their text, is stored in a relational database. 

Forgeries X Networks

Art forgeries have been a challenge for the art business and its collecting and preserving institutions not only since the sensational case of Wolfgang Beltracchi. From the end of the 19th century onwards, the journal "Mittheilungen des Museen-Verbandes - als Manuscript für die Mitglieder gedruckt und ausgegeben" ("Notices of the Museums Association - printed and issued as a manuscript for the members") appeared, which published current occurrences and findings relating to forgeries and suspected cases that had come to light.

Priestly libraries in the Dutch Republic

The pilot project aims to record the bibliographic information in the inventories of two priestly libraries of the Dutch Republic of the 18th century. The scholarly significance of such libraries is well known: They show what Catholic priests who served in the Dutch mission read or at least found useful. Moreover, these libraries tell us more about Dutch Catholic spirituality in the early modern period.

ReIReS – Research Infrastructure on Religious Studies

The IEG was one of the cooperation partners of the Horizon 2020 funded project "Research Infrastructure on Religious Studies" (ReIReS). ReIReS was a starting community whose aim was to create a unique and groundbreaking research infrastructure on religious studies within the European Research Area.