“Nemo me impune lacessit.” (49)
This means “no one injures me with impunity. Or, “nobody messes with me and gets away with it.” This motto can’t be the motto of the Montresor family, because it’s the motto of the Scottish Royal Coat of Arms. Montresor, who is constantly fibbing, conveniently appropriates it to make a point – a point that’s sadly lost on Fortunato.