No king had anything to do with the actual writing of the KJV. The actual translating (writing) of the KJV was done by a committee of 47 scholars and clergymen over the course of many years. They did a wonderful job. One individual—
Richard Bancroft, the
archbishop of Canterbury—was notable for having the role of overseer of the project.
Ir is impossible to translate with absolute accuracy one language into another, but they did a job the reflects the Lord.
The history that affects this translation is the history of the gentile persecuting the Jews. This was considered proper during the time the KVJ was written, and you can see this idea reflected in such as their translation of Passover as Easter.