In this drawing, Fontana explicitly shows a cipher wheel (Bellicorum is c. 1420):
![[Image: 4260780769_851f266a66.jpg]](http://farm3.static.flickr.com/2689/4260780769_851f266a66.jpg)
Maybe Fontana encrypted the text to demonstrate how the cipher wheel could be used.
![[Image: 4260780769_851f266a66.jpg]](http://farm3.static.flickr.com/2689/4260780769_851f266a66.jpg)
Maybe Fontana encrypted the text to demonstrate how the cipher wheel could be used.


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