פירוש על מלכים א 16:23

In the thirty-first year of the reign of Asa, etc., Omri reigned. An undisputed reign. His conflict with Tivni lasted five years, from the twenty-seventh year of Asa[’s reign] until the thirty-first [year].

For twelve years. Was the total [of his reign], five [years] were in conflict and seven [years] his reign was undisputed. It is impossible to say that his reign was undisputed for twelve years, because Achov his son reigned in the thirty-eighth year of Asa[’s reign].

In Tirtzoh he reigned six years. Before he had built Shomron.