1 Kings 16:23

In the thirty and first year of Asa king of Judah began Omri to reign over Israel, twelve years: six years reigned he in Tirzah.

In the thirty and first year of Asa ... began Omri to reign х `Aamªriy (H6018); i:e., perhaps, 'aamªriyaah, servant of Yahweh; Septuagint, Ambri]. The twelve years of his rule are computed from the beginning of his reign, which was in the 27th year of Asa's royalty. He held a contest for supremacy four years with Tibni; and then, at the dates stated in this verse, entered on a sole and peaceful reign of eight years.