What if the then future King James II of Great Britain had died while his brother Charles II was still alive? For the sake of argument let's say that this hypothetical death occurs sometime between 1677-1685. Would his daughter Mary have ascended to the throne upon Charles' death? Or would there be some further complication that I'm ignoring here? What would the absence of James II's reign, and the subsequent Glorious Revolution have upon British history? What might Mary's reign look like here and how would it differ from the historical reign of William and Mary? What impact does the absence of Jacobitism have upon British history? Assuming that both Mary and Anne die without surviving children, would Parliament still pass something resembling the Act of Settlement here? In short, what happens here?