Melachim Alef 22:41

41 And Yehoshaphat ben Asa began to reign over Yehudah in the fourth year of Ach’av Melech Yisroel.

Melachim Alef 22:41 Meaning and Commentary

1 Kings 22:41

And Jehoshaphat the son of Asa began to reign over Judah in
the fourth year of Ahab king of Israel.
] And as Ahab reigned twenty two years, ( 1 Kings 16:29 ) , Jehoshaphat must reign about eighteen years with him, and seven years after him.

Melachim Alef 22:41 In-Context

39 Now the rest of the acts of Ach’av (Ahab), and all that he did, and the Bais HaShen (House of Ivory) which he made, and all the cities that he built, are they not written in the Sefer Divrei HaYamim l’Malkhei Yisroel?

40 So Ach’av slept with his avot; and Achazyahu beno (his son) reigned in his place.

41 And Yehoshaphat ben Asa began to reign over Yehudah in the fourth year of Ach’av Melech Yisroel.

42 Yehoshaphat was 35 shanah when he began to reign; and he reigned 25 shanah in Yerushalayim. And the shem immo was Azuvah bat Shilchi.

43 And he walked in kol derech Asa aviv; he turned not aside from it, doing that which was yashar in the eyes of Hashem; nevertheless the high places (places of pagan worship) were not taken away; for HaAm offered and burned incense yet in the high places.