PEACE.
Isaiah prophesied of the birth of Jesus.
"For unto us a child is born, unto us a son is given: and the government shall be upon his shoulder: and his name shall be called Wonderful, Counsellor, The mighty God, The everlasting Father, The Prince of Peace." - Isaiah 9:6 KJV
Isaiah said Jesus would be The Prince of Peace. Jesus made peace by His blood on the cross.
"And, having made peace through the blood of his cross, by him to reconcile all things unto himself; by him, I say, whether they be things in earth, or things in heaven." - Colossians 1:20 KJV
Jesus brought peace between Himself and man when He shed His sinless blood to pay the price for our sins. He reconciled us back to Himself.
"To wit, that God was in Christ, reconciling the world unto himself, not imputing their trespasses unto them; and hath committed unto us the word of reconciliation." - 2 Corinthians 5:19 KJV
The Wonderful Counsellor that is The mighty God and The everlasting Father took upon Himself the form of man, and brought peace between Himself and man. Jesus is The Prince of Peace.