The major English-language encyclopedia on Catholic topics, it contains some 17,000 articles, each with a bibliography emphasizing the primary sources. Unfortunately many of the articles in the 2003/online edition are reprints from the 1967 edition without any updating. Use this work to get an overview of a subject and to see how it can be divided into narrower topics for a paper.

Up to date, and intended for both novices and specialists, this 4-volume set covers European history, society, religion, and culture between A.D. 500 to 1500. Articles number about 5,000. They range from brief to lengthy, include bibliographies, and often unearth material you can only find elsewhere with difficulty. Women and children, for example, get substantial attention. The set contains a thematic listing of entries, a general index, a list of medieval popes and antipopes, and an index of alternative place names.

Including more than 5,000 signed articles ranging in length from 100 to 10,000 words, this 13-volume set is the major scholarly encyclopedia for medieval studies and is intended for all levels, from the high school student to the scholar. All volumes are available online on the Internet Archive, a trusted source, but one for which it is necessary to create a free account and login.

V1, AAC-AUG
V2, AUG-BYZ
V3, CAB-CRI
V4, CRO-FAM
V5, FAM-GRO
V6, GRO-ITA
V7, ITA-MAB
V8, MAC-MYS
V9, MYS-POL
V10, POL-SCA
V11, SCA-TEX
V12, THA-ZWA
V13, Index
Supplement 1.

Both online and in print, and containing more than 1,500 articles, this 5-volume set is the major encyclopedia for Celtic studies.

Viking invasions, language, mythology, saints, clothing, craftsmanship, architecture—these are some of the many topics covered in this encyclopedia. The entries, centred on such themes as lineage, manuscripts, persons and scholarship, focus on the period 500 to 1600 A.D., and come with cross-references and bibliographies. There are alphabetical and thematic tables of contents.

This introduction to German and Dutch-speaking Europe focuses on the region’s major people, events, places, daily life, and accomplishments between roughly 500 and 1500 A.D. Alphabetical entries on such topics as patronage, diet and nutrition, and Segher Diengotgaf are made accessible through a list of entries by category (e.g. Music; Persons; Religion and Theology; Women, Gender and Families), as well as by the usual index at the back.

Pick up this 2-volume set for an introduction to mediaeval Italian life and culture. With nearly 1,000 entries ranging from 500 to 10,000 words, and covering specific topics in the brief articles (e.g. Camerino, Duchy of) and general topics in the lengthy ones (e.g. Florence), this set includes 3 pages of maps, along with a reference list of Popes and Rulers in the appendix.

In entries varying from 500-word descriptions to 3,000-word overviews, this encyclopedia aims at helping undergraduates and the general public in coming to grips with the political, social, religious, economic, intellectual, literary and artistic history of France between roughly 500 and 1500 A.D.. Various useful lists complement these entries: The Kings, Counts, Dukes; Popes; Architectural Terms; and Musical Terms.