15thc perception on swallowtail merlons?

[Koen G]

There's a really nice example circulating without any MS reference. 
See here: You are not allowed to view links. Register or Login to view.

It is also the first image in the Britannica article: You are not allowed to view links. Register or Login to view.

"The Crusaders' siege of Jerusalem in 1099, miniature from Descriptio Terrae Sanctae (“Description of the Holy Land”) by Burchard of Mount Sion, 14th century."

I consulted some versions of this work already but apparently I missed the correct one :/