Why does rabbinic literature identify France with Tzarfat? Tzarfat itself is mentioned only a few times, namely 'Ovadia 1:20, along with the only istance of Sepharad (which is identified with Spain) and Melachim 1:17:9-10.
Is this identification part of a general project of the rabbis using biblical place names for European regions? If so, what are their earliest references to these usages?