Daniel BellingradtYou see a handy paper plate offering access to all (!) Popes, Roman Emperors, Emperors of the Holy Roman Empire, a lot of Christian kings, and more minor rulers. You need to move the paper pointer, find the correct ring, and read the information. #skystorians: it's an #earlymodern paper tool.
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The paper tool was published in 1692, as part of a book featuring curious questions and knowledge-based answers made by Georg Philipp Harsdörffer. You may access the book and the paper plate here:
digital.slub-dresden.de/werkansicht/...
The video in this posts shows the plate zoomed in.
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And as the paper tool was published in a book, this is #bookhistory too.
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As some of you asked: the timeline with the famous rulers runs only up to 1692 - the year this volvelle was published.