15thc perception on swallowtail merlons?

[MarcoP]

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"The gate remained in use after antiquity with some modifications. The battlements (merlons) on the upper part date to the medieval period (10th century), at which time the city came to be held by the Ghibellines."

I saw that, while researching Rimini, and I thought it is not reliable: no sources are given, which is a bad sign. I tried searching for information about the dating of the merlons, but with no luck.