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How long did Omri reign?
“In the thirty and first year of Asa king of Judah began Omri to reign over Israel twelve years.... So Omri slept with his fathers, and was buried in Samaria: and Ahab his son reigned in his stead. And in the thirty and eighth year of Asa king of Judah began Ahab the son of Omri to reign” (1 Kings xvi, 23, 28, 29).
From the thirty-first to the thirty-eighth year of Asa’s reign Omri is said to have reigned twelve years.