For he built up again the high places which Hezekiah his father had destroyed; and he raised up altars for Baal, and made an idol pole, as did Ahab king of Israel; and worshiped all the army of heaven, and served them.
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George Leo Haydock
Groves. Hebrew Ashera, "the grove "or the idol of Astarte, (Calmet) as both were worshipped. (Haydock)
Achab, whom he imitated also in spilling the blood of the saints. (Menochius)