A headless horse

A legend tells of a strange presence in Via dei Crociferi.
Tired of the continuous amorous and political meetings that took place below their homes by night, the inhabitants spread rumours of a “headless horse”.
In order to prove the story unfounded, a brave young man decided to plant a nail under the arch.
However, in his haste he also nailed down part of his cloak and was struck by fright, convinced that the headless horse had caught him, and died of fear.