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Heliodorus
Heliodorus was a chancellor to Seleucus IV Philopator, a king of the Seleucid Empire. During his time in office, he attempted to tax the Temple in Jerusalem, which led to his downfall.
Some historical sources say that Heliodorus assassinated Seleucus IV, but regardless of whether or not he was responsible for the king's death, he declared himself regent after the death and seized power for himself. However, his regency was short-lived. The brother of the late king, Antiochus IV Epiphanes, was aided by the Pergamese monarch, Eumenes II, and arrived in Antioch. The Greek aristocracy favored Antiochus IV, and Heliodorus was overthrown.