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Lieutenant-Colonel Sir Arthur Henry McMahon, GCMG, GCVO, KCIE, CSI (28 November 1862 — 29 December 1949) was a British diplomat and Indian Army officer who served as the High Commissioner in Egypt from 1915 to 1917 He was also an administrator in British India, and served twice as Chief Commissioner of Balochistan. McMahon is best known for the McMahon-Hussein Correspondence, as well as the McMahon Line between Tibet and India.
Born in 1862, McMahon was commissioned a Lieutenant in the Indian Staff Corps in the 1880s and was appointed a CIE in 1894. By 1897, he had been promoted to a captaincy and was appointed a CSI in that year. He was promoted to a majority in the army in 1901. He was knighted with the KCIE in 1906 and promoted to the rank of Lieutenant-Colonel in 1909. In 1911, on the occasion of the Delhi Durbar, he was appointed a GCVO and was appointed to the post of High Commissioner in Egypt in 1914. In 1915, he was made a Knight of Grace of the Order of St John (KStJ). He was appointed a GCMG in 1916 upon his retirement from the Indian Army.
In 1920, he was awarded the Order of El Nahda, 1st Class from the King of the Hejaz. In
1925, he was promoted to a Knight of Justice in the Order of St John.