The Medieval literary period can be broken down into two distinct periods: Old English (428 - 1066 CE) and Middle English (1066 - 1450 CE) Periods. Themes often included Christianity, chivalry, and mans achievement - real or imagined. Listed below are some Websites that will help you in your research. The Websites listed below will help you with your research.
Dictionary of Early Christian Literature by 
Dictionary of Medieval Latin from British Sources by 
Encyclopedia of the Middle Ages by 
The Feminist Companion to Literature in English by 
Guide to British Poetry Explication by 
Mediae Latinitatis Lexicon Minus by 
Medieval Folklore by 
Researching the Song by 
The Cambridge Companion to Medieval English Literature, 1100-1500 by 
Christian Tradition in English Literature by 
The Four Funerals in Beowulf by 
The Language of Old and Middle English Poetry by 
Lyrics of the Middle Ages
Poetry Does Theology by 
The Rhetorical Poetics of the Middle Ages by 
Writing the Oral Tradition by 
Death and Purgatory in Middle English Didactic Poetry by 
Chivalry and Violence in Medieval Europe by 
Dictionary of Medieval Knighthood and Chivalry by 
The Knight and Chivalry by 
Arthurian Myths and Alchemy by 
The Treasure of the City of the Ladies by 
