The writing was in the name of King Ahasu-e'rus and sealed with the king's ring, and letters were sent by mounted couriers riding on swift horses that were used in the king's service, bred from the royal stud.
Revised Standard Version of the Bible, copyright 1952 [2nd edition, 1971] by the Division of Christian Education of the National Council of the Churches of Christ in the United States of America. Used by permission. All rights reserved.
(Revised Standard Version - Holy Bible)