Months: Names of the Twelve: Twelfth, Adar
Source: TTT
Ezra 6:15
And this temple was completed on the third day of the month of Adar, in the sixth year of the reign of King Darius.
Esther 3:7
In the twelfth year of King Xerxes, in the first month, the month of Nisan, the Pur (that is, the lot) was cast before Haman to determine a day and month. And the lot fell on the twelfth month, the month of Adar.