15thc perception on swallowtail merlons?

[cvetkakocj@rogers.com]

What I think is that the position some people like to take that the swallowtail merlons are just arbitrary or meaningless is rather less tenable than they believe.

Did anybody ever wonder if the swallow tail  merlons have anything to do with the ancient Celtic tribe of Latobici, located in Roman times in the present day Lower Carniola (Dolenjska region of Slovenia). LASTOVICA in Slovenian means SWALLOW. 

Or perhaps some Carthusian monk was thinking of Mary and doodled a whole row of M-letters on what looks like a retaining wall.