The king of Persia during the time of Esther, identified as Xerxes I (486-465). See Chapter 16.

Ahasuerus (Hebrew אֲחַשְׁוֵרוֹשׁ, Standard Hebrew Aḥašveroš, Tiberian Hebrew ʾĂḥašwērôš, commonly transliterated Achashverosh) is a name used several times in the Hebrew Bible, as well as related legends and apocrypha. The name is generally thought to be equivalent to Xerxes, both being derived from the original Persian Khashayar-sha.