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United States Naval Academy: Papacy and Empire
This comprehensive summary details the history of the strained relationship between the kings and popes during the time period of 955-1356. Their fight for dominance is outlined by date with primary source documents, pictures, artwork,...
Wikimedia
Wikipedia: Medieval Inquisition
A Wikipedia article that reports on the Medieval Inquisition throughout Europe during the 12th and 13th centuries. Discusses the origin and history as well as the procedure of investigation, trial, torture, and punishment.
Rice University
Galileo Project: Historical Overview of the Inquisition
This article defines an inquisition, which is a legal proceeding of the Catholic Church and not restricted to a particular institution such as the Spanish Inquisition.