Claudius
SARAH: Claudius has decided to send Hamlet to England for the demand of Denmark's neglected tribute. Ralph, let's explain what Shakespeare is referring to.
RALPH: Well, today, Denmark is a relatively small country. But in the medival period, when the story of Hamlet takes place, it was a powerful empire which included portions of Norway, Sweden, and Scotland; and Danish viking ships sacked and pillaged towns along the coast of England.
SARAH: To avoid these devastating raids, England was forced to make a large annual payment to the Danish King.
RALPH: By sending Hamlet to England to collect this tribute, Claudius is being clever. To the court at Elsinore, the prince is being sent to England on royal business.
SARAH: Yet, the English king, being a vassal to the king of Denmark, would be obliged to do whatever Claudius demanded - in this case, making sure that Hamlet never comes back.