This series (originally published in from 1886 -1922 in 55 volumes) is a consolidation of the history and text of hymns of the Catholic Church, 500 - 1400...

A "digital library of text and information about people, places and businesses from the medieval and early modern period...

Comprehensive guide to both primary and secondary sources on the Byzantine Empire...

Covers the "crusades from their origins in the eleventh century up to the early modern period...

Huge "collection of all catholic available texts, declared of public knowledge, written in the main Christianity’s languages...

Online encyclopedia of early church history...

"These links connect to Western European (mainly primary) historical documents that are transcribed, reproduced in facsimile, or translated...

A large collection of medieval and Byzantine primary source documents, featuring full texts, law texts, a section on Saints' lives and maps...

Complete text, in Greek, of early documents of the Christian Church to 1439...

Complete text, in Latin, of early documents of the Christian Church to 1439...