King in Prussia
William III and Mary II had no legitimate children. After William's death in 1702, his heir in the Netherlands was John William Friso of Nassau-Diez, who assumed the title, King William having bequeathed it to him by testament. The other contender was the King in Prussia, who based his claim to the title on the will of Frederick Henry, William III's grandfather. Eventually, a compromise was reached by which both families were entitled to bear the title of Prince of Orange. By then, it was no more than a title because the principality had been annexed by Louis XIV of France.