2 Chronicles 18:28 KJV

So the king of Israel and Jehoshaphat the king of Judah went up to Ramothgilead.

Jehoshaphat's alliance with AhabThis history we read in 1Ki 22. Abundant riches and honour give large opportunities of doing good, but they are attended with many snares and temptations....

1 Kings 22:29–33 So the king of Israel and Jehoshaphat the king of Judah went up to Ramothgilead. …

From OpenBible.info, most relevant first.

Timeline of the Bible918–889 BC · Jehoshaphat reigns in Judah; Ahab reigns in Israel

IsraelThe name conferred on Jacob after the great prayer-struggle at Peniel (Gen 32:28), because “as a prince he had power with God and...
JehoshaphatJehovah-judged. (1.) One of David’s body-guard (1 Chr 11:43).
JudahPraise, the fourth son of Jacob by Leah. The name originated in Leah’s words of praise to the Lord on account of his birth: “Now will I...
Ramoth-gileadHeights of Gilead, a city of refuge on the east of Jordan; called “Ramoth in Gilead” (Deut 4:43; Josh 20:8; Josh 21:38). Here Ahab, who...

So the king מֶלֶךְ melek מֶלֶךְ Noun · masculine singular construct
of Israel יִשְׂרָאֵל yiśrāʾēl יִשְׂרָאֵל Proper name
and Jehoshaphat וִיהוֹשָׁפָט wîhôšāpāṭ יְהוֹשָׁפָט Proper name · with and
the king מֶלֶךְ melek מֶלֶךְ Noun · masculine singular construct
of Judah יְהוּדָה yĕhûdâ יְהוּדָה Proper name
went up וַיַּעַל wayyaʿal עָלָה Verb · qal sequential imperfect, third person masculine singular · with and
to Ramothgilead אֶל ʾel Preposition רָמֹת rāmōt רָמֹת גִּלעָד Proper name גִּלְעָד gilʿād גִּלְעָד Proper name

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