“I am the Lord, … your King”. 

Isa 43:15 NIV 

Kings are out of date in the modern world. But in some cycle races there is a “King of the Mountains”. And some other sports develop stars who distinguish themselves so well that they earn themselves the nickname of king. “King Kallis” was one.
Kings were very much in vogue in the days of the Bible. Every country had one, and some who were emperors were king of more than one country. Some centuries after the exodus from Egypt, when they had settled in Israel, the Israelites desired to have a king and Saul was their first. It is significant that he was anointed king by Samuel the priest, thus indicating that his authority was derived from God himself. When the Babylonians conquered the remnant of Israel in Jerusalem, of course they lost their king and in exile came under the rule of the Babylonian king, Nabonidus. Isaiah was therefore speaking in a provocative way when he gave the Lord’s message, that he, Jehovah-God, was their real and true king. No earthly Israelite king could rescue them – there wasn’t one. But God was even then asserting his sovereignty over all the human kings and the children of Israel would soon find their God-King coming to reign in a dramatic change of historical events. When he did, he showed up the human and earthly kings for the weak and temporary potentates they really were.
When Jesus Christ, risen from the dead, ascended to heaven he came to be acknowledged as occupying “the right hand” of the Father. We recognize him now as the good shepherd, the Messiah, the Son of God, and as “the high king of Heaven”.

Lord, your kingdom come on earth as it is in heaven.