His son Charles Hitchcock Sherrill (1867–1936) was U.S. Minister to Argentina from 1909 to 1910, and United States Ambassador to Turkey from 1932 to 1933.
King was then temporarily released, and in the following summer George P. Marsh, then minister to Turkey, was charged by the U. S. government with the special investigation of his case, and also to look into King's title to a lot of land, the use of which he had been deprived of by the Greek government for 20 years with no compensation.
After reading about the map's discovery in The Illustrated London News, United States Secretary of State Henry L. Stimson contacted the United States Ambassador to Turkey Charles H. Sherrill and requested that an investigation be launched to find the Columbus source map, which he believed may have been in Turkey.
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In 1916 he was appointed by Woodrow Wilson to be the United States Ambassador to the Ottoman Empire in Constantinople.