Ahasuerus was not the king of Persia by right of birth. He owed his position to his vast wealth, with which he purchased dominion over the whole world.
He had various reasons for giving a gorgeous feast. The third year of his reign was the seventieth since the beginning of Nebuchadnezzar's rule, and Ahasuerus thought it quite certain that the time had passed for the fulfilment of the prophecy of Jeremiah foretelling the return of Israel to the Holy Land. The Temple was still in ruins, and Ahasuerus was convinced that the Jewish kingdom would never again be restored. Needless to say, it was not Jeremiah who erred. Not with the accession of King Nebuchadnezzar had the prophet's term of years begun, but with the destruction of Jerusalem. Reckoned in this way, the seventy years of desolation were at an end exactly at the time when Darius, the son of Ahasuerus, permitted the rebuilding of the Temple.