Melachim Bais 14:17

17 Amatzyah Ben Yoash Melech Yehudah lived after the mot Yehoash Ben Yehoachaz Melech Yisroel 15 shanah.

Melachim Bais 14:17 Meaning and Commentary

2 Kings 14:17

And Amaziah the son of Joash king of Judah lived after the
death of Jehoash son of Jehoahaz king of Israel fifteen years.
] Which, with the fourteen he reigned contemporary with him, made the twenty nine years he reigned, ( 2 Kings 14:2 ) . The Vulgate Latin version is, "twenty five years".

Melachim Bais 14:17 In-Context

15 Now the rest of the acts of Yehoash which he did, and his gevurah, and how he warred against Amatzyah Melech Yehudah, are they not written in the Sefer Divrei HaYamim LMalkhei Yisroel?

16 And Yehoash slept with his avot, and was buried in Shomron with the Malkhei Yisroel; and Yarov‘am bno reigned in his place.

17 Amatzyah Ben Yoash Melech Yehudah lived after the mot Yehoash Ben Yehoachaz Melech Yisroel 15 shanah.

18 And the rest of the acts of Amatzyah, are they not written in the Sefer Divrei HaYimim L’Malkhei Yehudah?

19 Now they plotted kesher against him in Yerushalayim; he fled to Lachish; but they sent after him to Lachish, and assassinated him there.