Following certain links on ORB's pages will take one outside of ORB's domain. ORB provides such links only if the site contains a much more detailed analysis of a particular issue than is possible in the page from which it is linked or if it contains some relevant source materials that aren't otherwise available.

Although ORB takes what it believes are reasonable steps to ensure that the materials within its domain represent the current state of academic thought on issues of medieval history, it has no authority to vet the materials contained on externally linked pages or their parent sites. We further note that the contents of an externally linked page or its parent site may change from time to time without notice to ORB, and that the reasons for an author's or editor's initial decision to link to that page may no longer hold true.

We caution our readers that certain recitations of "facts" within externally linked pages or their parent sites may be inaccurate in whole or in part. Furthermore, deductions, conclusions and opinions expressed in those externally linked pages or their parent sites represent the views of their authors, and are expressly not endorsed by ORB.

As an organization formed by practicing historians, ORB is keenly aware that source materials vary in their reliability and, even when completely trustworthy, are subject to widely varying interpretations. ORB encourages its readers to use a critical eye when examining any source materials (whether historical or current, and including those reproduced within ORB's domain) or any secondary materials containing deductions, conclusions or opinions as to the meaning of those source materials or of historical or current events generally.

For help in evaluating web sources, we recomment the following:

• Thinking Critically about World Wide Web Resources by Esther Grassian, UCLA College Library

• Evaluating Information Found on the Internet, by E. E. Kirk, Johns Hopkins

• Evaluating Web Resources by Jan Alexander and Marsha Ann Tate, Widener Library