Over time, King James II is not living up to his promise to protect the Protestant faith, at least in the eyes of may of his people. He has surrounded himself with Catholic advisers and has asked Parliament to repeal legislation forbidding Catholic appointments to his Privy Council. When the Queen gives birth to a son - many believe her child died at birth and was substituted with another - several members of the House of Lords invite Prince William of Orange, who is married to King James II's eldest daughter Mary, to come to England and assume the throne. King James II soon realizes that he must flee to France when Churchill and many others go to the Protestant side. In offering the throne to William and Mary, Parliament also agrees that William will be King for his lifetime, even if the Queen should predecease him. The royal court is soon filled with Dutch advisers, much to the consternation of those English Lords who supported the new monarchs. Sarah Churchill meanwhile continues to hold favor with Princess Anne, now next in line to the throne.
—garykmcd