CASTLEREAGH, Robert Stewart, Viscount. 19417 Autograph Letter Signed ‘I am dear Sir, very faithfully yours, Castlereagh’, to George Rose, Secretary to the Treasury, thanking him for the Communication, “which I shall have great pleasure in perusing and it may tempt me to read Fox’s Book regularly through which I own as yet, I have never had the perseverance to do”. 2 pp. 9 x 7 inches, folds, in good condition, with an integral blank leaf. St James’s Square, Friday, undated. Fully autograph letters by Castlereagh are uncommon. Robert Stewart, Viscount Castlereagh (1769-1822), statesman, foreign secretary.