Try a Subject search in MARQCAT on the following categories; each one produces different results:
middle ages, medievalism, civilization medieval
Follow these steps:
1. Go to the MARQCAT Box immediately below.
2. Click on the dropdown arrow to the left and select Subject instead of Title.
3. In the search window enter one of the subject categories above.
4. Click on Submit.
Use the list of subject categories in your results to refine your search. Click on a subject category to see the bibliographic records for the books listed under it.
The AHA Guide to Historical Literature will get you started on any time period anywhere in the world. The link is to the online version.