http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Early Christianity, ca. 150-600 -- Early-Medieval Christianity, ca. 600-1050 -- High-Medieval Christianity, ca. 1050-1300 -- Later-Medieval Christianity, ca. 1300-1500.
Includes bibliographical references and index.