15thc perception on swallowtail merlons?

[R. Sale]

So it's a second-hand story - four times over? That does make it more interesting.

What is the best provenance for the origins of swallowtail merlons within the HRE??

The 15th Century perspective can also be evaluated in part from the 16th C. While this reference is too late for the investigation, it does offer a comparative perspective to all the earlier Ghibelline representations.

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Of course this is Florence, on the opposite side of the ideological divide at the time. There is a significantly smaller portion of heraldic insignia using architectural representations (castles or towers), and while some of those images lack for clarity, none that I saw can be called Ghibelline. Additionally there are also examples of the Anjou chief, which was the later opponent to the imperial eagle. There are no imperial eagles here.

Then there is the example: GHVARDI

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It appears to have been a rather emphatic expression of opinion. No question about their structure.