In Melachim 1:22:7-28 and in Divrei Hayamim 2:18:6-27 we're told that Yehoshafat joined his father-in-law Achav to do battle with Aram. Unsure of the future, they decide to ask prophets what will be the outcome of the battle. Achav assembles 400 false prophets and they all say that Am Yisrael (the two kingdoms) will be victorious. Still doubtful, Yehoshafat requests a prophet of Hashem be brought. Michayhu ben Yimlah is brought, and he warns Achav that he'll fall in battle. Angry, Achav sends Michayhu to jail.
I was wondering why Yehoshafat didn't do anything for Michayhu. After all, Michayhu was brought to the camp at his own behest, so it's kind of his fault that Michayhu, at that time at least, said things that Achav didn't like. Moreover, Yehoshafat was in general a good and righteous king. One would expect he'd do his best to defend a prophet of Hashem.
