The accession of George IV. to the throne in the beginning of 1820 brought to a crisis the quarrel between the new King and his wife, and led to the resignation of Canning in the last days of the year, and Lord Liverpool then tried to induce Peel to enter the Cabinet in the vacant post of President of the Board of Control. Peel, however, refused the office, declaring that he differed from some of the proceedings of the Ministry about the Queen. In the summer of 1821 he again declined a similar offer, chiefly, as it appears, on the ground of uncertain health and of a dislike to official life which his recent marriage had produced. But when Lord Sidmouth resigned the Home Office, Peel proved less inflexible, and on January 17, 1822, he accepted the seals, which he held till 1827. In August Castlereagh, or, as he now was, Lord Londonderry, committed suicide. Lord Liverpool saw the necessity of recalling Canning to the Cabinet as Minister of Foreign Affairs, and Canning would accept the post only as leader of the House of Commons. The King hated Canning, and would gladly have excluded him altogether from the Ministry, and Eldon and the Duke of Newcastle greatly desired that the leadership of the House of Commons should be given to Peel. Canning, however, who had been sixteen years longer in Parliament than Peel, had both the right and the power to insist upon the leadership, and Peel acquiesced in his claim with honourable frankness. Except on the Catholic question they appear to have cordially agreed, and something of the success of Canning's brilliant foreign policy is due to the loyalty with which he was supported by Peel in the Cabinet and at Court.