The meaning of Mithredath in the Bible
(From International Standard Bible Encyclopedia)

mith'-re-dath (mithredhath; Persian = "gift of Mithra" or "consecrated to Mithra"):

(1) The Persian treasurer through whom Cyrus restored the sacred vessels to the returning Jewish exiles (Ezra 1:8).

(2) A Persian, perhaps an official, who was associated with Bishlam and Tabeel in corresponding with Artaxerxes concerning the restoration of Jerusalem (Ezra 4:7). In 1 Esdras 2:11,16, the name is written MITHRADATES (which see).

See more on the meaning of Mithredath in the Bible:
Mithredath {Easton's Bible Dictionary}
Mithredath {Hitchcock's Bible Name}

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