15thc perception on swallowtail merlons?

[Pierre Dumont Himself]

It does look like there's an extra "arc" of depictions outside the range of castles.
I've added Noli and Gorizia.
The tower of Noli stands out because it might represent the western edge of the merlons' distribution in Liguria. Albenga almost certainly lacked them, and all the church frescoes between Albenga and Nice show Guelph merlons. I also can't seem to find any in the mountians between Liguria and the Piemonte.
I'll have another look at the Castello di Avio after I'm done with the Piemonte. I already have two more identifications in that area.
I'm against adding Rene's castle because the dating of the manuscript is uncertain and Otto Piper argues that merlons found exclusively on the keep tend to be later decorative additions.
For the sake of comparison, here's a 1457 map of castles near Chieri, all showing swallowtail merlons. I'm not yet convinced that we should include them.

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