Kings III 16:23

23 In the thirty-first year of king Asa, Ambri begins to reign over Israel twelve years: he reigns six years in Thersa.

Kings III 16:23 In-Context

21 Then the people of Israel divides; half the people goes after Thamni the son of Gonath to make him king; and half the people goes after Ambri.
22 The people that followed Ambri overpowered the people that followed Thamni son of Gonath; and Thamni died and Joram his brother at that time, and Ambri reigned after Thamni.
23 In the thirty-first year of king Asa, Ambri begins to reign over Israel twelve years: he reigns six years in Thersa.
24 And Ambri bought the mount Semeron of Semer the lord of the mountain for two talents of silver; and he built the mountain, and they called the name of the mountain which he built, after the name of Semer the lord of the mount, Semeron.
25 And Ambri did that which was evil in the sight of the Lord, and wrought wickedly beyond all that were before him.

Footnotes 1

The Brenton translation of the Septuagint is in the public domain.