15thc perception on swallowtail merlons?

[Aga Tentakulus]

It is not so easy to find any that were built before 1450. After the political effect came the fashion. Because they look beautiful. Most of them came much later.

Example: Castello di Thiene
Was built as a villa or palace. Architect known. After 1478.
ca.1560 (architect known). Construction of the 2nd floor plus surrounding wall. Now it was given the name Castello.
Therefore the building is not mentioned. A lot of work, but it has to be done.

Note:
Battlements have a protective function to provide cover for archers and crossbowmen when they need to draw.
If battlements have no protective or combat function (villas, palaces, churches, etc.), they are merely decorative and should be sought in the 16th century.