 As long as there was a possibility of one of them succeeding him, the king's opponents saw his rule as a temporary inconvenience.When people began to fear that James's second wife, Mary, would produce a Catholic son and heir, a movement grew to replace him with his elder daughter Princess Mary and his son-in-law/nephew, William of Orange.When the prince was born, rumours immediately began to spread that he was an impostor baby, smuggled into the royal birth chamber in a warming pan and that the actual child of James and Mary was stillborn.