Why in the first pasuk of Megillas Esther is it written that Ahasuerus is the Ahasuerus that ruled from India to kush? Where there other Ahasuerus's that were important enough that in our bible we wrote "that the Ahasuerus is the Ahasuerus..."
One answer that I though about was that it is like saying Henry the 5th, but in our Torah we try not to add more words if we can avoid it. Since in our generation we do not know the other Ahasuerus's this part of the pasuk looks redundant the pasuk could of bean written as:
"וַיְהִי, בִּימֵי אֲחַשְׁוֵרוֹשׁ: הַמֹּלֵךְ מֵהֹדּוּ וְעַד-כּוּשׁ--שֶׁבַע וְעֶשְׂרִים וּמֵאָה, מְדִינָה"