'King of Israel' in the Bible

He saved others, cannot he save himself? He is the king of Israel, let him now come down from the cross, and we will believe in him.

Let the Christ, the king of Israel, come down now from the cross, that we may see and believe. And they that were crucified with him were reviling him.

Nathanael answered him, Rabbi, thou art the Son of God, thou art the king of Israel.

took branches of palmtrees, and went forth to meet him, crying aloud, Hosanna! blessed is he who cometh in the name of the Lord, even the king of Israel!