'Reign' in the Bible

This is a record of what happened during the reign of Ahasuerus, the Ahasuerus who ruled over 127 provinces from India to Cush.

In the third year of his reign, he made a feast unto all his princes and his servants; the power of Persia and Media, the nobles and princes of the provinces, being before him:

Then the young woman who pleases the king will become queen instead of Vashti.” This suggestion pleased the king, and he did accordingly.

So Esther was taken unto king Ahasuerus into his house royal in the tenth month, which is the month Tebeth, in the seventh year of his reign.

and the king loveth Esther above all the women, and she receiveth grace and kindness before him above all the virgins, and he setteth a royal crown on her head, and causeth her to reign instead of Vashti,

In the twelfth year of the reign of King Ahasuerus, in the first month (the month Nisan), the (that is, the lot) was cast in Haman's presence to determine the best day and month to carry out his plot. The lot indicated the twelfth month, the month Adar.