About Martin Charteris, Baron Charteris of Amisfield
Lieutenant-Colonel Martin Michael Charles Charteris, Baron Charteris of Amisfield, 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.
Biography source: Wikipedia. The profile adds birthday-specific historical context from the Celebs Birthday Today editorial database.