Melachim Bais 15:30

30 And Hoshea Ben Elah plotted a kesher against Pekach Ben Remalyah, attacked him, assassinated him, and reigned as melech in his place, in the 20th year of Yotam Ben Uziyah.

Melachim Bais 15:30 Meaning and Commentary

2 Kings 15:30

And Hoshea the son or Elab made a conspiracy against Pekah
the son of Remaliah, and smote him, and slew him, and reigned in
his stead
Did by him as he had done by Pekahiah, ( 2 Kings 15:28 ) , this was measure for measure, as the Jews say: and this he did

in the twentieth year of Jotham the son of Uzziah;
and yet Jotham is said to reign but sixteen years, ( 2 Kings 15:33 ) , this must be reckoned therefore either from the time of his being viceroy, and judging Israel in his father's lifetime, ( 2 Kings 15:5 ) or this was the fourth year of Ahaz, and the twentieth year, reckoning from the time Jotham began to reign, who is the rather mentioned, because as yet the historian had taken no notice of Ahaz.

Melachim Bais 15:30 In-Context

28 And he did that which was rah in the eyes of Hashem; he departed not from the chattot Yarov‘am Ben Nevat, who caused Yisroel to commit sin.

29 In the days of Pekach Melech Yisroel came Tiglat Pileser Melech Ashur (Assyria), and took Iyon, and Abel Beit-Ma’achah, and Yanoach, and Kedesh, and Chatzor, and Gil‘ad, and the Galil, all the Eretz Naphtali, and carried them away into the Golus of Assyria.

30 And Hoshea Ben Elah plotted a kesher against Pekach Ben Remalyah, attacked him, assassinated him, and reigned as melech in his place, in the 20th year of Yotam Ben Uziyah.

31 And the rest of the acts of Pekach, and all that he did, behold, they are written in the Sefer Divrei HaYamim L’Malkhei Yisroel.

32 In the second year of Pekach Ben Remalyah Melech Yisroel began Yotam Ben Uziyah Melech Yehudah to reign as melech.