From the death of Darnley, still more after her Protestant marriage, she had ceased to be the champion of her own Church. That was again her position when she came to England. There, she was heir to the throne, and the centre of all the hopes and efforts to preserve or to restore Catholicism. The story of Mary Stuart cannot be told without an understanding in regard to the Casket Letters. They are still the object of an incessant controversy, and the problem, although it has made progress of late, and the interest increases with the increase of daylight, remains unsolved. The view to be taken of the events depends essentially on the question of authenticity. If the letters are what they seem to be, the letters of the queen to Bothwell, then she is implicated in the murder of her husband. If they are not authentic, then there is no evidence of her guilt. Everybody must satisfy himself on this point before he can understand the ruin of the Catholic cause in Scotland and in England, and the consequent arrest of the Counter-Reformation in Europe. At the same time the issue does not seriously affect the judgment of History on the character of the queen herself. She repeatedly expressed her delight in murder, and her gratitude to those who executed or attempted it, and stands on the same level of morality with the queen her mother-in-law, or with the queen her rival. But the general estimate does not throw light on the particular action, and supplies no help in a hanging matter. The opinion of historians inclines, on the whole, in her favour. About fifty writers have considered the original evidences sufficiently to form something like an independent conclusion. Eighteen of these condemn Mary, thirty pronounce her not guilty; two cannot make up their minds. Most of the Catholics absolve, and among Protestants there is an equal number for and against. The greater names are on the hostile side. They do not carry weight with us, because they decided upon evidence less complete than that which we possess. Four of the greatest, Robertson, Ranke, Burton, Froude, were all misled by the same damaging mistake. The equal division of the Protestants shows how little any religious bias has had to do with the inquiry; so that the overwhelming majority on the Catholic side requires explanation.