I believe I forgot to tell you I was made a Duke.
Source, in full
Postscript to a letter to his brother Henry Wellesley (22 May 1814), published in Supplementary Despatches and Memoranda of Field Marshal Arthur, Duke of Wellington, K. G.: South of France, embassy to Paris, and Congress of Vienna, 1814-1815. Editors: Arthur Richard Wellesley Duke of Wellington, Arthur Richard Wellesley Wellington (2d Duke of). Editor: J. Murray, 1862. Origin of the original: Universidad de Michigan. Digitized: 28 November 2006. p. 100. Arthur Wellesley, 2nd Duke of Wellington