בִּשְׁנַת֩ שְׁלֹשִׁ֨ים וְאַחַ֜ת שָׁנָ֗ה לְאָסָא֙ מֶ֣לֶךְ יְהוּדָ֔ה מָלַ֤ךְ עָמְרִי֙ עַל־יִשְׂרָאֵ֔ל שְׁתֵּ֥ים עֶשְׂרֵ֖ה שָׁנָ֑ה בְּתִרְצָ֖ה מָלַ֥ךְ שֵׁשׁ־שָׁנִֽים׃
Nel trentunesimo anno di Asa re di Giuda iniziò Omri a regnare su Israele e regnò dodici anni; per sei anni regnò a Tirza.
Rashi on I Kings
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].
Rashi on I Kings
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].
Rashi on I Kings
In Tirtzoh he reigned six years. Before he had built Shomron.