Duke Wilhelm IvEdit

There are several historical figures named Wilhelm IV who held ducal titles in different regions and time periods. To make sure I write an accurate encyclopedia article, which Wilhelm IV do you have in mind? For example, there were notable Wilhelms IV in Bavaria (the Wittelsbach line, associated with the Reinheitsgebot beer purity law), and others in different principalities.

If you’d like, I can proceed with the Bavarian Wilhelm IV and frame the article from a conservative, traditional-institutions perspective, or you can specify a different Wilhelm IV (and region) and I’ll tailor accordingly.