Another precedent was also forced on Henry's mind. On 11th March, (p. 200) 1527, two months before Wolsey opened his court, a divorce was granted at Rome to Henry's sister Margaret, Queen of Scotland.[562] Her pretexts were infinitely more flimsy than Henry's own. She alleged a precontract on the part of her husband, Angus, which was never proved. She professed to believe that James IV. had survived Flodden three years, and was alive when she married Angus. Angus had been unfaithful, but that was no ground for divorce by canon law; and she herself was living in shameless adultery with Henry Stewart, who had also procured a divorce to be free to marry his Queen. No objection was found at Rome to either of these divorces; but neither Angus nor Margaret Mortimer had an Emperor for a nephew; no imperial armies would march on Rome to vindicate the validity of their marriages, and Clement could issue his bulls without any fear that their justice would be challenged by the arms of powerful princes. Not so with Henry; while the secret proceedings before Wolsey were in progress, the world was shocked by the sack of Rome, and Clement was a prisoner in the hands of the Emperor's troops. There was no hope that a Pope in such a plight would confirm a sentence to the detriment of his master's aunt. "If the Pope," wrote Wolsey to Henry on receipt of the news, "be slain or taken, it will hinder the King's affairs not a little, which have hitherto been going on so well."[563] A little later he declared that, if Catherine repudiated his authority, it would be necessary to have the assent of the Pope or of the cardinals to the divorce. To obtain the former the Pope must be liberated; to secure the latter the cardinals must be assembled in France.[564] (p. 201) [Footnote 562: _L. and P._, iv., 4130.] [Footnote 563: _Ibid._, iv., 3147.] [Footnote 564: _L. and P._, iv., 3311.]