15thc perception on swallowtail merlons?

[Pierre Dumont Himself]

The map is taken from Valegio Francesco's "Raccolta Di Le Piu Illustri Et Famose Citta Di Tutto Il Mondo," published in Venice in 1595. 
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This is a volume of "popular" maps that was continuously reprinted in the largest cities of Italy, much like the contemporary maps of Matteo Florimi and Pietro Bertelli, or the later compilations of Merian and Joan Blaeu. The first edition was published in 1579, and was mostly based on maps from one or two decades earlier, in which the sun may have looked different. Cf. this 1629 map by Bertelli, possibly based on the same source.