Offers peer-reviewed annotated bibliographies on European and Mediterranean civilization from the 4th to the 15th centuries. Bibliographies are browseable by subject area and keyword searchable
Encompasses both religious and secular imagery, including Christian, Jewish and Islamic works, from the first centuries of the Common Era until the sixteenth century.
Decretum Gratiani (a.k.a., Decretum Gratiani aka Concordia discordantium canonum aka Concordantia discordantium canonum aka the Decretum) is a collection of canon law compiled and written in the 12th century as a legal textbook by the jurist known as Gratian.
A project to publish online and in print new editions and translations of all English legal codes, edicts, and treatises produced up to the time of the Magna Carta (c. 1215).
Provides a searchable bibliography of texts – from private letters, wills, and household accounts to literary works, philosophical treatises, chronicles, court proceedings, church records, and a host of other documents – that were written in the Middle Ages and are now available in printed or online editions and translations.
A collection of letters to and from women dating from the 4th to the 13th century AD. Written in Latin, the letters are presented with English translations and are organized by the women participating in the exchange.
Covers journal articles, book reviews, and essays in books about women, sexuality, and gender during the Middle Ages. A collaborative project hosted by the University of Iowa.
The Oxford Dictionary of the Middle Ages (4 Volume Set) by 
The Grove Encyclopedia of Medieval Art and Architecture by 