Christian sources

Biblindex: Index of Biblical Quotations in Early Christian Literature (https://www.biblindex.org/fr)

Corpus synodalium. Local Ecclesiastical Legislation in Medieval Europe (https://corpus-synodalium.com/) 

Documenta Catholica Omnia (www.documenta-catholica.eu)

EarlyChurch. Resources on the history of the ancient Church (www.earlychurch.org.uk) 

Christian Classics of Ethereal Library (www.ccel.org/) 

Chrysostomus Latinus in Iohannem Online (https://clioproject.net) 

Hill Museum and Manuscript Library (https://haf.vhmml.org)

IntraText Bibliotheca Religiosa (http://www.intratext.com/BRI/) 

Intratext Digital Library Enchiridion Vaticanum (www.intratext.com/EVI/) 

Mandements des princes-évêques de Liège, du M-Â à 1802 - Cartes et plans du diocèse de liège (http://www.evequesdeliege.be/)

Gorgias Encyclopedic Dictionary of the Syriac Heritage (https://gedsh.bethmardutho.org/index.html)