The Messiah would be King of the Jews.
OT Prophecy NT Fulfillment
Psalm 2:6
"Yet have I set my king upon my holy hill of Zion."
John 12:12–13
[12] On the next day much people that were come to the feast, when they heard that Jesus was coming to Jerusalem,
[13] Took branches of palm trees, and went forth to meet him, and cried, Hosanna: Blessed is the King of Israel that cometh in the name of the Lord.

John 18:37
Pilate therefore said unto him, Art thou a king then? Jesus answered, Thou sayest that I am a king. To this end was I born, and for this cause came I into the world, that I should bear witness unto the truth. Every one that is of the truth heareth my voice.
Tanakh – Ketuvim – Psalms 2:6
"Truly it is I that have established My king upon Zion, My holy mountain."
Hebrew OT – Psalms 2:6
[2:6] וַאֲנִי נָסַכְתִּי מַלְכִּי
עַל־צִיּוֹן הַר־קָדְשִׁי