Josephus gave Solomon a reign of 80 years, either because he wished to increase the glory of his country’s greatest king, or through his having a false reading in his copy of the Septuagint Version. It is, no doubt, remarkable that the three successive kings, Saul, David, and Solomon, should have each reigned forty years Act 13:21; 2 Samuel 5:4-5; but such numerical coincidences occur from time to time in exact history.
Related Commentaries of 1 Kings 11:42
1 Kings 11:42
42 And the timeg that Solomon reigned in Jerusalem over all Israel was forty years.