Mithradates
Hastings' Dictionary of the Bible [1]
Mithradates . 1. Esther 2:11 Esther 2:11 = Mithredath , Ezra 1:8; Ezra 1:2 . (AV [Note: Authorized Version.] Mithridates) Esther 2:16 Esther 2:16 = Mithredath , Ezra 4:7 .
International Standard Bible Encyclopedia [2]
mith - ra - dā´tēz (Codex Alexandrinus Μιθραδάτης , Mithradátēs ; Codex Vaticanus Μιθριδάτης , Mithridátēs ; the King James Version Mithridates ):
(1) The treasurer of Cyrus to whom the king committed the vessels which had been taken from the temple and who delivered them to the governor, Sanabassar (1 Esdras 2:11 = "Mithredath" of Ezra 1:8 ).
(2) Apparently another person of the same name - one of the commissioners stationed in Samaria who wrote a letter to Artaxerxes persuading him to put a stop to the rebuilding of Jerusalem (1 Esdras 2:16 = "Mithredath" of Ezra 4:7 ).