False prophet and horns......

In this passage we meet one of the false prophets and see the term "horns" used.

1Ki 22:11    And Zedekiah the son of Chenaanah made him horns of iron: and he said, Thus saith the LORD, With these shalt thou push the Syrians, until thou have consumed them.

Zedekiah

Not the later king but.

2. Son of Chenaanah. (See MICAIAH, son of Imlah). 1 Kings 22; 2 Chronicles 18. He is distinguished by Jehoshaphat ("is there not here besides a prophet of Jehovah, that we might inquire of him?") from Jehovah's prophets. Zedekiah therefore was one of the "400 prophets of the GROVES" , (Asheerah Ashtaroth) who apparently were not slain when Elijah slew the 450 prophets of Baal (1Ki 18:19; 1Ki 18:22; 1Ki 18:24), or rather a prophet of the calves symbolizing "Jehovah," for they spoke in Jehovah's name (1Ki 22:8). Compare as to his assumption of horns Amo 6:13. Josephus adds (Ant. 8:15, section 3) that Zedekiah denounced Micaiah as contradicting Elijah, who foretold that dogs should lick up Ahab's blood in the vineyard of Naboth of Jezreel; and defied Micaiah to wither the hand with which he smote his cheek, as the prophet from Judah had done to Jeroboam. Fausset.

1 Kings 22:11

Zedekiah the son of Chenaanah made him horns of iron — Small projections, of the size and form of our candle extinguishers (worn in many parts of the East as military ornaments), were worn by the Syrians of that time, and probably by the Israelite warriors also. Zedekiah, by assuming two horns, personated two heroes, and, pretending to be a prophet, wished in this manner to represent the kings of Israel and Judah in a military triumph. It was a symbolic action, to impart greater force to his language (see Deu 33:17); but it was little more than a flourish with a spontoon [Calmet, Fragments]. JFB

1 Kings 22:11

And Zedekiah the son of Chenaanah made him horns of iron,.... Horns are emblems of power and might, and iron ones of greater strength still; the prophets sometimes made use of visible signs, to represent the things they prophesied of should come to pass, see Isa 20:2, and the same method this prophet took:

and he saith, thus saith the Lord; imitating the true prophets: with these shall thou push the Syrians until thou hast consumed them: Abarbinel thinks he had in view the blessing of Joseph by Moses,Deu 33:17 where he is compared to a bullock with horns; and these said to be the ten thousands of Ephraim, and the thousands of Manasseh; and Ahab being of the tribe of Joseph, and ruling in Ephraim and Manasseh, the prophet chose to make use of this emblem for his encouragement. Gill.

Note horns were also mentioned in..

Psalm 75

King James Version (KJV)

75 Unto thee, O God, do we give thanks, unto thee do we give thanks: for that thy name is near thy wondrous works declare.

² When I shall receive the congregation I will judge uprightly.

³ The earth and all the inhabitants thereof are dissolved: I bear up the pillars of it. Selah.

⁴ I said unto the fools, Deal not foolishly: and to the wicked, Lift not up the horn:

⁵ Lift not up your horn on high: speak not with a stiff neck.

⁶ For promotion cometh neither from the east, nor from the west, nor from the south.

⁷ But God is the judge: he putteth down one, and setteth up another.

⁸ For in the hand of the Lord there is a cup, and the wine is red; it is full of mixture; and he poureth out of the same: but the dregs thereof, all the wicked of the earth shall wring them out, and drink them.

⁹ But I will declare for ever; I will sing praises to the God of Jacob.

¹⁰ All the horns of the wicked also will I cut off; but the horns of the righteous shall be exalted.

They also figure prominently in Revelation...for example:

Rev 12:3    And there appeared another wonder in heaven; and behold a great red dragon, having seven heads and ten horns, and seven crowns upon his heads.

Rev 13:1    And I stood upon the sand of the sea, and saw a beast rise up out of the sea, having seven heads and ten horns, and upon his horns ten crowns, and upon his heads the name of blasphemy.

Rev 13:11    And I beheld another beast coming up out of the earth; and he had two horns like a lamb, and he spake as a dragon.