If you describe a man as the king of something, you mean that he is the most important person doing that thing or he is the best at doing it. He was the king of the cowboys. 

That is about as close a relationship as we have to the term “King”, in our modern experience.  We did not grow up in a country with a king.  There is no ultimate authority in Canada that would be like a king.  There isn’t someone that we would all run out into the streets and pledge our allegiance to.  So how do we connect with the concept of Jesus as King as Israel would have understood it, and in addition to that Jesus as Savior King.