Negotiations between George II and his brother-in-law Frederick William I of Prussia on a proposed marriage between the Prince of Wales and Frederick William's daughter Wilhelmine were welcomed by Frederick even though the couple had never met. George II was not keen on the proposal but continued talks for diplomatic reasons. Frustrated by the delay, Frederick sent an envoy of his own to the Prussian court. When the King discovered the plan, he immediately arranged for Frederick to leave Hanover for England. The marriage negotiations foundered when Frederick William demanded that Frederick be made Regent in Hanover.