The name of the city is first mentioned by Xenophon in his expeditionary logs in Achaemenid Assyria of 401 BC, during the reign of the Persian Achaemenid Empire. There, he notes a small Assyrian town of “Mépsila” (Ancient Greek: Μέψιλα) on the Tigris somewhere about where modern Mosul is today (Anabasis, III.iv.10).