15thc perception on swallowtail merlons?

[Mark Knowles]

I Googled: Castello Ghibelline

Then looked under "Images"

Then looked through the list to see if there were examples not on our list.

(I started by searching for: Abbazia Ghibelline

But Abbeys with Swallow tail merlons seem very rare. Saints Nazzaro and Celso Abbey seems to be somewhat of an exception.)