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Lieutenant-Colonel Martin Michael Charles Charteris, Baron Charteris of Amisfield, GCB, GCVO, OBE, QSO, PC (7 September 1913 – 23 December 1999) was a British Army officer and courtier of Queen Elizabeth II. Charteris was the longest-serving Assistant Private Secretary to the Sovereign, having served for over 18 years in that position. Later, he became Private Secretary to the Sovereign. Wikipedia