15thc perception on swallowtail merlons?

[Pierre Dumont Himself]

Was the Abbazia di Santi Nazzaro e Celso added to the map?
And is it the only religious building with Swallow-tail merlons on the map?

Yes, it's already up there. It was completely rebuilt between 1427 and 1469, so it overlaps somewhat with the radiocarbon dates for the MS.
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I managed to count another four, not including episcopal palaces. Can you not see the map?