15thc perception on swallowtail merlons?

[R. Sale]

Following on from Castello di Salorno, Haderburg, there is Castel d'Enna (Schloss Enn) which looks like a similar possibility.

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The last photo shows the wall.

Also ran into some illustrations, which are hopefully new. Some of them lack a few details, like a proposed location. The forth image is Constantinople with swallowtail merlons. The banner on the right, a black lion rampant on gold, is the insignia of Flanders. So this is probably depicting the fourth Crusade and the era of Baldwin of Flanders.

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The seventh illustration shows that Troy also was pictured with swallowtail merlons, and they also appear in "Queste del Saint Graal" and the others.

Or perhaps the real perspective is that all but one were made in Italy and the majority of those in Milan or Venice.